The 22-year-old striker, who has netted ten times for The Millers this season, has fallen out with manager Mark Robins after refusing to agree with a wage deferral after administrators were called in to the Yorkshire club last month.
However, although far from happy with the situation, Robins will listen to offers after the player failed to show up for training.
"He has kicked his team-mates in the teeth and also the fans who have supported him," Robins told the Sheffield Star.
"He is under contract at this football club and I will not let this club be walked all over if I can help it and I shall try and do the best I can and ensure that no-one takes advantage of the club in its current predicament."