Millwall have set a £2million asking price for their striker Lee Gregory, according to The Sun.
The 27-year-old has been linked with a move to Celtic in recent weeks after his impressive performances in League One last campaign.
Gregory scored 26 goals in all competitions for the Lions in a season that saw the club reach the League One play-off final. Their 3-1 defeat to Barnsley in the final, though, means Gregory will be playing in the third tier of English football once again next campaign.
Entering the prime of his career, Gregory may feel a move North of the border could be the right time for his career. Celtic manager Brendan Rodgers has already talked openly about buying a striker to take some of the workload off 40 goal striker Leigh Griffiths.
Gregory has played most of his career at non-league English clubs but like Jamie Vardy, who he played alongside at Halifax Town, he is a late developer and has an excellent goal scoring record.