Bolton fear luckless United States international Stuart Holden could be set for yet another lengthy injury absence following his latest knee problem.
The 28-year-old has only played five times for Wanderers since March 2011, when a tackle by Jonny Evans, which earned the Manchester United defender a red card, saw his knee problems first surface.
His first comeback in September that year lasted just one game and he suffered another setback when he tore his anterior cruciate ligament on international duty in July.
On Monday night Holden took part in a Bolton Under-21s game for the first time since the summer but lasted only 23 minutes before limping off clutching that troublesome right knee.
"It's disappointing news for us all," said Wanderers boss Dougie Freedman.
"We don't know the exact result, (but) we feel that it's the same injury. He's had his scans and he's going to see his specialist on Monday.
"Hopefully he can read the scans and tell us good news, if not he'll need to go into the knee and have a little look."