Plymouth Argyle defender Dan Scarr will miss a significant part of the rest of the season because of a torn hamstring.
Pilgrims' boss Steven Schumacher has indicated that the 27-year-old will be out of action for four to six weeks.
Scarr picked up the injury in the closing seconds of the 4-1 away League One win against Crewe Alexandra on Tuesday night.
He was sent for a scan a couple of days later and the results were worse than Argyle head expected.
Scarr, who has been so impressive in his first season at the club, was replaced by James Bolton in the starting line-up for the league game against Shrewsbury Town at Home Park today
Argyle will be without Scarr for an important period of matches as they try to maintain their push for a play-off place after picking up 10 points from their last four games.
Schumacher said: "He went for a scan on Thursday and it wasn't good news. He's going to be out for a good few weeks. It's a tear in the hamstring.
"He will probably be four to six weeks out with it, which gives James Bolton a great opportunity and I thought he stepped in nicely today and did really well.
"We have got Romoney (Crichlow, the loan signing from Huddersfield Town) as well, so the four of them now are going to fight for those places."
Schumacher added: "I asked Dan on Thursday morning how he was and he said he felt a lot better. He had a bit of power in there, a bit of strength.
"But we sent him up to get a scan and the results were worse than feared for us. He will be a miss for us, obviously, because, he has been one of our best players all season.
"It's part and parcel of football and it gives somebody else an opportunity now."
Bolton missed the first four months of this season after his summer signing from Portsmouth due to an ankle injury and has been on the bench recently due to the form of Scarr, James Wilson and Macaulay Gillesphey.
The win against Shrewsbury was only Bolton's second league start for the Pilgrims, but he will have the chance to add to that tally considerably now.
Schumacher said: "Bolts has played in all of the positions across the back three or the back four, so he's versatile. He's a good defender, that's what we know.
"He's part of the squad, he understands it - and it's the same with Rom. We will need Rom in the next few games that are coming up.