The midfielder was slated to move to Celtic in 2019 and the deal was agreed for him to move, but he failed a medical at Parkhead due to a knee problem.


Turnbull had to undergo surgery but he came back to impress again for Motherwell before moving to Celtic a year later in the summer of 2020.



The 21-year-old has impressed this season and more or less cemented his place in the starting eleven in the second half of the campaign.


He is in the Scotland squad for the European Championship as well and Ferguson stressed that the character Turnbull showed to come back from the disappointment of missing out on the Celtic move the first time around is brilliant.



The former Scotland star insisted that despite Celtic’s poor season, the midfielder easily stood out at Parkhead.


Ferguson said on the Go Radio Football Show: “It was a tough time for him.



“Obviously missing out on the move the first time knowing that he had that knee problem.


“He didn’t know that he had that knee problem so he had to go away and obviously had to get the operation.


“He had to work through rehab and to come back and get that move again showed that he has a great character about him.


“I have been really impressed this season.


“Celtic have struggled this season as a team but he is one player who has stood out.”


Turnbull put in 39 appearances for Celtic this season and managed to hit the back of the net ten times.