Celtic winger James Forrest is set to miss Sunday's Scottish Cup semi-final against Hearts and could be out for the rest of the season.
Forrest has been out of action since sustaining a couple of knocks in last month's League Cup final defeat to Kilmarnock.
The 20-year-old is struggling to shake off the calf and ankle injuries and is almost certainly out of Sunday's showdown with Hearts.
Celtic boss Neil Lennon admits the Scotland international could be ruled out for the remainder of the campaign as the Bhoys look to complete a league and cup double.
"It's a possibility. We don't know yet," Lennon told the Daily Record.
"We are hopeful it will not rule him out for the season but he is just struggling with it a bit at the minute."