Celtic have been linked with a move for Romaine Sawyers this summer.
The Brentford midfielder is a target for the Scottish giants and they are prepared to submit an improved offer for him.
According to Daily Record, the Hoops submitted an initial offer of around £1.5m for the midfielder and it was turned down by the Championship outfit.
Celtic will now submit an offer of around £2.5m for the player.
It will be interesting to see if they can get the deal over the line in the coming weeks.
They are in desperate need of reinforcements in central midfield with Scott Brown past his peak.