BENJI SIEGRIST won't settle for a back-up role at Celtic according to a former coach who claims he'll challenge Joe Hart for the No1 spot.

The ex-Dundee United keeper made a free transfer move to Celtic yesterday to join Hart and Scott Bain as goalkeeping options for Ange Postecoglou.

And while Hart has been handed the No1 jersey in the off-season, Siegrist's former coach Stevie Frail reckons the Swiss stopper will challenge for the position.

Frail - who worked at Celtic and Dundee United - insists Siegrist has what it takes to perform for Celtic both with talent and attitude.

And he reckons Siegrist will push Hart to be first-choice keeper for the coming season and in turn drive the standards up among the goalkeeping cohort at Parkhead.

Speaking to the Scottish Sun, Frail explained: “Benji will go there with the mentality he’s good enough to play for Celtic — and I think that’s precisely the attitude you need if you’re going to a club of that magnitude.

“He’s got the desire to play at the highest level possible.

“His target will be to get the jersey. He will push Joe Hart all the way to be No 1.

“Hart is an excellent keeper with a tremendous pedigree and someone like Benji — a really good professional — could well push him to perform at an even greater level.

“That, of course, would only benefit Celtic, while there’s also another good keeper there in Scott Bain. Benji’s been in Scotland long enough. He’ll know the history and size of Celtic. And he’s still only 30.

“He won’t be satisfied with being a back-up goalie there, I’m sure that Siegrist will stake his claim to be first choice for Ange Postecoglou."