Former Manchester United midfielder Michael Stewart has written in The Scottish Sun that Celtic's Stefan Johansen has been disappointing all season.
Johansen, who has been on the books of Scottish Premiership giants Celtic since 2014, has not played well this campaign.
Former Hibernian and Hearts midfielder Stewart has criticised Deila for persisting with Johansen despite his struggles this campaign.
The former Scotland international has highlighted the Norwegian midfielder’s struggle against Old Firm rivals Rangers in the semi-finals of the Scottish Cup at Hampden Park in Glasgow last month to prove his point.
“There are so many players not getting a game at the moment while there are others like Stefan Johansen who have been putting in below-par performances for months,” Stewart wrote in The Scottish Sun.
“He has had a terrible season and you knew within five minutes of the Old Firm game that, with his confidence clearly low, the occasion was going to get the better of him. He gave the ball away too often and was sloppy in everything he did.
“It’s almost as if Celtic are going with the guys who guarantee you at best six out of ten rather than work hard on developing the ones who can potentially give you eight or nine.”
Celtic are on the verge of winning the Scottish Premiership title this season. The Hoops are at the top of the league table at the moment with 80 points from 35 matches, nine points clear of second-placed Aberdeen.
The Glasgow giants will take on Aberdeen at Celtic Park in the league on Sunday afternoon.