Boli Bolingoli-Mbombo has struggled for Celtic since his move in the summer transfer window.
The former Manchester United and Hibernian midfielder, who now works as a pundit for BBC Sport, believes that Bolingoli-Mbombo’s disappointing start to his career at Celtic is playing on his mind.
Stewart has also said that the 24-year-old left-back needs to stand up and work his way through.
The former Scotland international made the comments following Bolingoli-Mbombo’s performance for Celtic against AIK at Celtic Park in the first leg of their Europa League playoff round on Thursday evening.
Stewart said about Bolingoli-Mbombo on BBC Sport: “The only way he's going to get past it is by standing up and continuing to be counted and working his way through it. It's horrible as it's just the start of his Celtic career and nobody really knows what his abilities and skills are like yet, as we haven't seen him before.
“It's not like a player who has been in the country for years where people can draw back on historic form and say it's just a bad spell. There's clearly tension, you can see it's playing on his mind.
“You can see it as he walked off that it's weighing on his shoulders, he's hunched and looking at the ground. He just needs to try and work through it. Worst thing you can do is not play or hide, you'll get found out quicker.”
Bolingoli-Mbombo joined Celtic from Rapid Vienna in the summer transfer window for a fee reported by The Scottish Sent to be worth £3 million.
The left-back has not made a good start to life at Celtic Park, and it is clear that the 24-year-old is struggling.
Against AIK on Thursday evening, the defender did show some very encouraging signs and was involved in the opening goal for the Hoops.
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