Former Partick Thistle defender Liam Lindsay is being linked with a £5million move away from Barnsley.
The Daily Star report Celtic are one of several clubs around Europe who are keeping tabs on the former Jags defender, who has impressed at Oakwell.
Aston Villa and Leeds are also said to be keen and the Tykes now face a battle to hold onto one of their prized assets.
Lindsay has played a starring role for his side this season as they look to secure promotion back to the Championship and currently sit second behind leaders Luton Town.
The Hoops are in the market for central defensive help with Dedryck Boyata set to become a free agent and Filip Benkovic heading back to Leicester at the end of the season.
Lindsay, who has been overlooked by Scotland boss Alex McLeish, is adored by Barnsley supporters for his committed displays since his arrival in 2017.