Caley Thistle will be without striker James Keatings for several weeks after he tore ankle ligaments in training.
Keatings sustained the injury in training on Friday and missed the game with Dunfermline on Saturday, with Caley Thistle winning 1-0.
He played in all four league games as well as the Betfred Cup, following his move from Hamilton Accies in the summer.
The former Hearts and Hibernian forward had contributed three goals and four assists in those eight appearances.
The injury came in an accidental collision with team-mate Charlie Trafford prior to the weekend’s game, which saw Miles Storey keep his place up front to partner Jordan White.
Manager John Robertson believes it is a massive blow but has challenged the remainder of his forward line to step up.
Robertson said: “It was accidental – he turned and Charlie Trafford just caught him. They both went the same way, James flicked the ball up and they both went for it.
“He stood on his ankle and it twisted underneath him. It is a massive blow because he’s been a big player for us this season.
“But as we’ve said, we can replace him. You’re replacing him with a guy like Miles Storey, who has serious pace which helps in this league. We can mix up our front four like we did on Saturday.
“We’ve lost Sean Welsh (in the past), James Vincent and David Carson have stepped up. We’ve lost Brad McKay, Coll Donaldson and Shaun Rooney have stepped up.
“We’ve now lost James, so it’s up to Jordan (White), Nikolay (Todorov), Roddy (MacGregor), Aaron (Doran), (Tom) Walsh and Miles to do the business for us there.”
Robertson made seven changes from the Tunnock’s Cup win over Morton the week previous, with only Shaun Rooney, Coll Donaldson, Doran and Storey retaining their places.
MacGregor and Todorov both came off the bench at East End Park in a bid to turn the game in Caley Thistle’s favour, while Robertson’s options will be boosted further this week by the return of on-loan Middlesbrough man Mitch Curry from injury.
He said: “Miles Storey got a start, Todorov continues to come on and be a nuisance and Roddy MacGregor has got real talent. We’ve got a really strong bench.
“We’ve still got Mitch Curry to hopefully come back this week and Brad McKay on the way back. We’ve got decent strength in depth.”