With only two months to go before squad selections are finalised for Euro 2016, players are running out of time to impress.
Here Press Association Sport reporters to predict what the line-ups will be for England, Wales, Northern Ireland and the Republic of Ireland in their first matches of this summer's showpiece event in France.
Here are their verdicts:
ENGLAND (v Russia) - compiled by Simon Peach
JOE HART: England's undisputed number one will deservedly start the Euros, especially with main rival Jack Butland ruled out with a fractured ankle.
KYLE WALKER: The fight with Liverpool's Nathaniel Clyne is a tight one, but Tottenham's right-back perhaps edges it due to his eye-catching club form.
DANNY ROSE: Assuming Luke Shaw is unable to get fit in time, the Spurs left-back's impressive performances against Holland and France showed he is capable of winning the race for a highly competitive spot.
CHRIS SMALLING: His form has been one of few bright spots in a turbulent campaign at Manchester United, and Smalling is the only England defender whose place looks a certainty.
GARY CAHILL: This has not been the most successful season for Cahill but he remains a proven, sturdy presence at the heart of defence. John Stones is more capable technically but struggling for a game at Everton and looking shaky.
ERIC DIER: This season's transformation from defender to midfielder has been seamless. Jack Wilshere's belated return would be a threat but the man who scored the winner against Germany has looked solid for club and country.
DELE ALLI: The Tottenham theme continues thanks to talented teenager Dier proving yet again his capabilities at the highest level. Likely to be a mainstay for years to come.
JAMIE VARDY: England are blessed with an abundance of attacking options but shoehorning in Leicester's in-form forward is important, with his directness and pace a constant threat to defenders.
WAYNE ROONEY: The subject of so much debate but, if fit and in some semblance of form, he will be in the squad and almost certainly a starter. England's leader has doubters to confound.
DANNY WELBECK: Back from injury and looking good, the Arsenal forward has a fine international goal record and works tirelessly when played in wider areas.
HARRY KANE: The Premier League's top scorer has led the line impressively for the Three Lions and looks better placed to start than the oft-injured Daniel Sturridge.
WALES (v Slovakia) - compiled by Phil Blanche
WAYNE HENNESSEY: Undisputed number one goalkeeper who has shrugged off fears of being rusty at Euro 2016 by establishing himself at Crystal Palace.
CHRIS GUNTER: On target to become the first Wales player to win 100 caps and set to fill the right wing-back role, although he also offers a central defensive option.
JAMES CHESTER: Reliable in qualifying and will get the nod over James Collins in a three-man central defence after finally finding game-time at West Brom.
ASHLEY WILLIAMS: The rock on which Wales have built solid defensive foundations, his leadership skills and ability to sense danger have been crucial.
BEN DAVIES: Operates at left-back for Tottenham, but adaptable and just as comfortable filling a left-sided role in a three-man central defence for Wales.
NEIL TAYLOR: Offers good energy down the left and provides defensive diligence as well as width in attack and trying to get crosses into the penalty area.
JOE ALLEN: Excellent at breaking up play and launching counter-attacks from a midfield base, Allen's passing ability makes him key to Wales finding tempo in their game.
JOE LEDLEY: Does the dirty work alongside Allen in a two-man central midfield, closing down opponents and winning the ball to set creative players free.
AARON RAMSEY: Given the freedom to play in advanced positions, either to create chances for strikers or find space for shooting opportunities himself.
HAL ROBSON-KANU: Holds the ball up well in tight areas and a willing runner who occupies defenders to take the pressure off his forward partner Gareth Bale.
GARETH BALE: Seven goals in qualifying and the stardust in this Wales team, Bale is a huge attacking threat and on his day simply unplayable either aerially or on the floor.
NORTHERN IRELAND (v Poland) - compiled by Liam Blackburn
MICHAEL McGOVERN: Won the starting job when veteran Roy Carroll was ill last summer and the ex-Celtic trainee is now ingrained as the first choice.
STUART DALLAS: Chris Brunt's injury has left a void down the left-hand side and Dallas will have a role to play, either as a wing-back or a winger if Michael O'Neill deploys a back four.
JONNY EVANS: A three-time Premier League winner whose experience of the big stage will be vital for a national team in their first major tournament for 30 years.
GARETH McAULEY: McAuley is another defender who knows the game inside out and is a threat in the air from set-pieces at the other end.
CRAIG CATHCART: Arguably the most in-form player in this Northern Ireland team and his performances at Watford may have prompted the recent formation switch to ensure O'Neill could accommodate three top-flight centre-backs.
CONOR McLAUGHLIN: Could potentially be playing his football in League Two next year if Fleetwood are relegated, but he was a mainstay in qualification and gets up and down his flank well.
PADDY McNAIR: The Manchester United man was deployed in a holding midfield role against Wales last week and after excelling in Cardiff, he could be the surprising success story in the summer.
STEVEN DAVIS: Northern Ireland's captain makes everything tick in the middle of the park and he has bags of experience having played in a UEFA Cup final for Rangers as well as appearing for three different Premier League clubs.
OLIVER NORWOOD: If qualification is anything to go by, his set-piece deliveries will be key, particularly now Brunt can only watch on from the sidelines.
KYLE LAFFERTY: Seven goals in qualification did not sufficiently impress his club side, Norwich, but the forward has the chance to get back up to speed on loan with Birmingham.
JAMIE WARD: Newcomer Conor Washington will surely have done enough to be in the squad but it would be harsh to not start Ward, who can fill in out wide too.
REPUBLIC OF IRELAND (v Sweden) - compiled by Damian Spellman
DARREN RANDOLPH: Manager Martin O'Neill faces a big decision over which of his goalkeepers to start, but Randolph finished the qualifying campaign as the man in possession with Shay Given injured.
SEAMUS COLEMAN: A shoo-in at right-back, Coleman will be one of the first names on the team sheet.
JOHN O'SHEA: A veteran of more than 100 caps, O'Shea's experience will be vital throughout the tournament.
CIARAN CLARK: Clark faces a battle with Richard Keogh for the second central defensive spot, but impressed in the play-offs against Bosnia-Herzegovina in O'Shea's absence.
ROBBIE BRADY: A winger by trade, Brady has deputised at left-back on several occasions and while he is still learning his defensive duties, his ability to join the attack is a useful weapon.
GLENN WHELAN: A fixture in the team since Giovanni Trapattoni's reign, defensive midfielder Whelan provides security for the men ahead of him to get forward.
JAMES McCARTHY: One of the most naturally gifted men at O'Neill's disposal, McCarthy is capable at his best of taking a game by the scruff of the neck from the middle of the field.
JONATHAN WALTERS: Walters has made his name as a striker, but has more often than not in recent times been asked to occupy a wide midfield role for his country, bringing his brawn to both attacking and defensive tasks.
WES HOOLAHAN: A man with the inventive skills to unlock even the most stubborn of defences, Hoolahan's craft could prove vital.
JEFF HENDRICK: A workhorse midfielder who gets up and down the pitch, his industry and endeavour give Ireland extra vigour.
SHANE LONG: O'Neill's best hope of scoring a goal when veteran skipper Robbie Keane is not on the pitch, Long has at times been used as an impact substitute by O'Neill, but his power and pace are strengths which could get him the nod.