Former Celtic star Alan Rough has admitted he does not know why the Bhoys signed Scott Allan from Hibernian in the first place and is sure the midfielder will get better after leaving Parkhead.

Allan, who joined the Bhoys from Hibs in 2015, has now agreed on a deal to return to Easter Road when his contract at Parkhead expires in the summer.

The 27-year-old spent last season on loan at Hibs and has struggled to establish himself in Glasgow, after making the switch to Celtic under then manager Ronny Deila.

Allan has failed to make an appearance for the first team so far this season and has notched up just 17 appearances for Celtic.

Rough admitted he does not know why Celtic made the move for Allan in the first place and stressed that he is not the only player who has suffered a similar fate at Parkhead over the years.

“I think people at Celtic would have to answer that one [why did they sign Allan from Hibernian in the first place]”, Rough said on PLZ Soccer.

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“He has not been the only player like that who has went there and not been given a chance."

The former Scotland star also went on to claim that Allan will now start to show his best abilities, if he can stay at a club like Hibs and get more games over a few years in the capital.

“That’s why I’m saying, I think, we will see the best of him if he could just stay at a club for maybe two or three years and get more games obviously under his belt”, he added.

Allan, who is a product of the Dundee United academy, has represented as many as 10 clubs so far in his career in England and Scotland.