John Collins insists Celtic must not underestimate Inverness on Saturday

Celtic assistant manager John Collins insists the team will have to be at the top of their game to beat Inverness CT on Saturday.

John Hughes takes his side the Celtic Park on the back of an impressive 3-1 victory over Scottish Premiership title challengers Aberdeen on Monday.

Inverness again displayed their resolve when they rallied from losing an early goal to dominate the majority of the game with Aberdeen.

Collins has been impressed by the attitude of the Inverness players and he believes Celtic must be prepared for a tricky challenge as they look to consolidate their lead at the top of the table.

"They'll be full of confidence, looking forward to the game, as I say, they always give us a tough game, they are always organised, fit hard working and always pass the ball. They make you work to get your victories against them," Collins said.

"It will be no different on Saturday. We'll have to play well, work hard for 90 minutes to get a result."

Celtic have been building for the future with the acquisition of midfielder Kristoffer Ajer from Norwegian club Start.

The 17-year-old, who trained at Lennoxtown for a week at the start of the year, has signed a four-year contract with the Hoops and will join the club in June.

Collins revealed the Norway U21 international did not look out of place among seasoned first-team players, and he is confident Ajer will make an impression.

"Young Kristoffer came in for a week's training and did very well, trained well, 17 years of age he came on to the training field with the first-team boys and fitted in very well," Collins said.

"Showed up, lots of composure, calm on the ball, a good football player."