Celtic goalkeeper Craig Gordon will be out for "up to 12 weeks" with a knee injury, boss Brendan Rodgers has revealed.
The 35-year-old, who lost two years of his career to a knee problem before he joined the Hoops in 2014, stayed in at the interval of Saturday’s 1-0 win over Hibernian at Parkhead after clashing with former Celt Efe Ambrose.
Striker Leigh Griffiths came off with a recurrence of a calf injury minutes after scoring the winner in the first half and he will be out for up to four weeks and thus both players will miss the Europa League clash against Zenit St Petersburg next month.
Rodgers said: "Sad news for him (Gordon) and for us but of course we will need to have that cover for someone to come in and support Dorus de Vries so that is something that we are looking at.
"It is his other knee as opposed to the one that had been injured and gave him problems.
"The medical staff had a look at him at half-time and there was that instability in the knee so it was just unfortunate.
"He is a great professional and while we are saying 12 weeks we are hoping he will be back sooner than that and all being well he will be.
"Dorus will come in and play. Has been a very loyal number two and settled into the club and has been very good in recent performances.
"He is calm and assured and experience.
"Leigh is disappointed after having a series of knocks over the course of the season.
"You are probably looking up to four weeks with his calf strain."