Chesterfield pushed themselves back into the play-off mix ahead of a vital weekend in the battle for the top six.
The Spireites jumped to eighth with their superb 3-0 win over Gillingham on Tuesday night.
And with a visit to seventh placed Peterborough United, who sit two points above Chesterfield having played a game more, there is a real opportunity to insert themselves firmly into the battle.
It will be the ideal time to do so with sixth placed Barnsley up against Preston North End, currently in second spot.
Ninth placed Fleetwood Town are up against Bradford City which could see a gap begin to form between those still in contention and those falling away.
Spireites have won their last three trips to London Road and over the years have generally been a bogey side for Posh, so they will be desperate to continue that run to overhaul the side being managed on a caretaker basis by Dave Robertson.
Cook will have Sam Morsy available again so will have to decide whether to reintroduce him to the successful midweek eleven.
Logic would indicate that for such a vital away game, he’d replace Gboly Ariyibi, who would possibly be used for the final half hour when tired legs could be susceptible to his pace.
Without doubt Sam Clucas will continue in his lone striking role.
The former Mansfield Town man, normally a wide midfielder, has played much of his recent football at left-back but Caolan Lavery’s recall by Wednesday and Byron Harrison’s absence due to a family bereavement meant the 24-year-old was thrust into action in attack.
He rewarded the manager’s faith by scoring at the start and end of the game to take his seasonal tally to ten as Spireites completed a win double over Gillingham.