Stoke City are facing a nervous few days ahead as they wait to find out they extent of Joe Allen's injury in Wales' recent clash with Belgium.
Allen was named in the starting XI for the first game of their World Cup qualifier, but only lasted seven minutes, as he was forced off injured.
Wales went on to lose the game 3-1 against Belgium, and they'll be looking to bounce back with a positive result in their next game against Mexico during this month's international break.
Wales' caretaker manager Robert Page issued an update on Allen's fitness, and revealed that the former Swansea City man will be assessed on Thursday.
"It seems to be behind the back of his knee. Either the top of his calf or the bottom of the hamstring, so we're not quite sure yet.
"He's with the physios at the minute and they're assessing him so we'll get them all back home and we'll assess all the players again in the morning."
His recent injury problem will be a real worry for Stoke City and Michael O'Neill, with the Potters still in contention to make a late push for a top-six finish this term.
The Potters are currently sat 11th in the Championship table, and are ten points adrift of sixth-placed Reading, as they turn their attentions to their final eight matches of this year's campaign.
Allen has been an important member of the Stoke City squad this season, with the Welsh midfielder making 19 appearances in all competitions, whilst also chipping in with two assists so far.
The Verdict:
They'll be hoping it's not too serious of an injury.
Allen has been an important member of the Stoke City team in recent seasons, and his experience and ability on the ball is always a plus for the Potters.
Stoke still have an outside chance of reaching the play-off positions this term, and Michael O'Neill will be eager to have as many of his key players available to him heading into the final eight matches of this year's campaign.
Allen is certainly one of those, and he'd leave a sizeable void in the Stoke midfield if he was to be ruled out of action for a prolonged spell.