Frank McAvennie is adamant that David Turnbull will believe that he can “walk into” the Celtic first team after he completed his move from Motherwell.

The former Hoops and St Mirren forward, speaking exclusively to Football Insider correspondent Dylan Childs, claimed that the challenge for the 21-year-old will be keeping his place in the team with a wealth of midfielders already at Parkhead.

The club confirmed the signing of the centre-midfielder yesterday after Football Insider revealed that the deal was all but done at the beginning of this week.

Turnbull, who has scored once in five appearances so far this season, put pen to paper on a four-year deal at Celtic Park and became Neil Lennon’s third summer signing.

The Scotland Under-21 international told fans that he will “make an impact” in Glasgow when speaking to the press yesterday.

When asked by Football Insider if he expected Turnbull to be an instant success at the club, McAvennie said: “The boy has confidence.

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“You do not sign for a club unless you believe you can walk into the team. He will say that he will spend time adjusting to things but I do not think he is shy coming forward. He will think that he can get into that team – I intend that as a compliment.

“Once he is in it is about keeping his place because there is a lot of competition in the midfield at Celtic.”

When speaking on first team opportunities, Turnbull said: “Hopefully, I’ll push other players and they’ll push me with the competition as well. It’s all about 100 per cent every day and whenever the gaffer’s ready to put me in, I’ll be ready.

“I’m looking to kick on and give more competition to the squad… I believe in my ability. I feel like I can come here and make an impact.”

In other Celtic news, Neil Lennon has been told to bin star player after huge reveal.