Adam Idah has done enough to prove Celtic must sign him permanently from Norwich City this summer, according to Chris Sutton.

The 23-year-old has been at the heart of a transfer saga after impressing on loan at Parkhead last season, with the Hoops keen to bring him back to Scotland and City holding firm on their valuation.

With Idah keen on a return to Celtic and the Canaries open to selling for the right price, Sutton has urged Brendan Rodgers' side to make a move happen.

"Adam Idah has already proven his worth to Celtic," he said. "That has its own value in terms of Brendan Rodgers and the squad. It’s why this deal needs to be sealed.

"Idah came up trumps for Celtic last season at the time when he really needed him. I wasn’t sure the striker would be able to deliver quite in the manner that he did, but he proved himself adept. It wasn’t just the goals Idah scored, it was the importance of them.

"That’s proven ability in the matches where it matters and that’s what you have to pay for. Celtic may have to shell out a little more than they would like to get it over the line, but Idah is no project now.

"He’s shown he’s the real deal and that’s why, even if they have to go a little further in the spend, it’s a deal that has to be concluded."

That doesn't mean the Scottish champions should simply give in to City's demands, however, and Sutton has encouraged his former clubs to meet in the middle.

"I’m not saying that Celtic should just bow to Norwich’s every whim here," he continued in his Daily Record column. "Negotiations are always delicate and there is give and take in any deal. Norwich have to be realistic.

"Idah had lost his way at Carrow Road. I think he even said he didn’t feel wanted, so who is to say that, despite getting the confidence boost from his efforts in Glasgow, that he wouldn’t just return to being a bit-part player in the English Championship.

"Celtic also have to be realistic and know that here is a guy who has proven himself. We all know that it is not always easy for players to settle into the club with the demands and expectations.

"Better players than Idah have gone into that environment and, quite frankly, not been able to deliver for whatever reason. The fact Idah has shown he can do it means there was always going to be a couple of quid added to the fee."