Bolton and Birmingham City are interested in signing Brentford striker Clayton Donaldson.
The Bees hitman will be able to walk away for nothing when his contract expires at the end of the month.
Brentford have offered the former Crewe frontman an improved deal, although he has yet to agree fresh terms at Griffin Park.
Championship rivals Rotherham have also expressed an interest in the 30-year-old, who topped the Bees' scoring charts with 18 goals last season as they clinched promotion from League One.
However, Donaldson is understood to be keen to remain in TW8, while boss Mark Warburton is bullish about his chances of keeping hold of the prolific marksman.
“When we first spoke to him about a new contract earlier in the season he said he wanted to play in the Championship and ideally that would be with Brentford," Warburton said last week.
“I have spoken to him and conversations have been positive. I hope we can wrap up Clayton’s future quickly.”
The ex-Hull City trainee attracted the interest of Wolves and Millwall last summer, while the Bees also rejected a £250k bid from Turkish side Trabzonspor in 2013.
Donaldson has plundered 53 goals in 155 games since his switch from Gresty Road in 2011.
