Barnsley striker Tom Bradshaw could leave the club for Millwall this week.
The Welsh international was one of the club’s better players last season despite relegation from the Championship.
But the 25-year-old hitman, who joined the Reds for £600,000 in July 2016, is understood to be in advanced talks with the Lions and an immediate return to the second tier.
Lions boss Neil Harris is keen to strengthen his forward line after narrowly missing out on the promotion play-offs last season.
The London-based club finished eighth, missing out on the play-offs by just three points.
And Harris is understood to have faith that Bradshaw, who scored 12 goals in 44 matches last season for the Reds, can help the Lions challenge for promotion once again.
Reading and Hull City are also understood to be interested in signing Bradshaw, especially as they can offer him the opportunity to play in the Championship instead of League One this season.
The Welshman has already impressed in pre-season scoring three goals in two games.
The former Walsall and Shrewsbury Town centre-forward bagged a brace in a 2-0 win over Gainsborough Trinity in the Reds’ first pre-season fixture of the season.
And he was on target on again on Tuesday night at Daniel Stendel’s team thumped York City 7-1 at Bootham Crescent in the second outing of their pre-season campaign.
Meanwhile, promising winger Dylan Mottley-Henry believes the Reds are starting to reap the rewards of their hard work in pre-season.
New boss Stendel has been pushing his squad and nine goals in two pre-season fixtures understandably gives grounds for optimism.
“It’s been tough with a new manager coming in,” admitted Mottley-Henry, who was on target in the 7-1 win over the Minstermen.
“We’ve had to get used to the new formations and tactics, but I think we’ve adapted really well and thankfully got the result we deserved.
“Pre-season is there to get that rust out and to get going. I’ve got a chance to prove to the manager what I’ve got.
“We’ve got some big games against Hull and West Brom coming up on a big pitch at Oakwell, so it’s a chance to impress the manager.
“I’m taking every game as it comes and I’m ready to take my chances.”