Midfielder Mark Davies has signed an extension to his contract with Bolton, keeping him at Wanderers until 2017.
Davies, 25, joined Bolton from Wolves in January 2009 and has played 130 times for the club, scoring 13 goals.
His season has been but has returned to good effect in February, helping Dougie Freedman's side go five games unbeaten.
But a knee problem forced him off during the first half of the on Tuesday.
Freedman confirmed Davies will have a scan on Wednesday to discover the extent of the injury.
There was interest in Davies from the Premier League at the beginning of the season following Bolton's relegation from the top flight, with
"I wanted to get it done," Freedman told BBC Radio Manchester. "I came into the club [in October] and they were talking to him. It was dragging on a little bit and I wanted to put an end to it.
"I want him to be at the club and I think the fans do. I want to build the team around him, so I just tied up the loose ends."
A 2-1 defeat at Watford on 2 February left Bolton 20th in the Championship and
But Wanderers took 11 points from the next 15 on offer and now lie 10th, seven points from the play-offs.
"We're playing very well," added former Crystal Palace boss Freedman.
"Away from home, our defensive displays have been great and on the attack we're getting better."