Former Edinburgh man McCall joined the Warriors on a training contract this summer and is delighted to be back in the professional ranks.

“I was really grateful when Sean called and discussed joining Glasgow on a training contract,” said the 22-year-old, who will start at outside centre.

“I’ve really enjoyed being part of the squad and feel that being out of the professional game for a few years has reinforced my appetite for the game at this level.

“The Ospreys are a quality side and I’m really looking forward to getting another opportunity to perform in the Magners League.”

Lineen added: “Dave has had a great pre-season and has fitted into the squad very well. He is a real athlete and has matured a lot over the past few months.

“Not only will he be up against a side full of internationals, but littered with British Lions as well. It will be a massive test for him but I’m confident that he’s got the goods.”

Lineen's changes backfired last week as the Dragons inflicted Glasgow's first defeat of the season. He has therefore recalled the fit-again Thom Evans and Moray Low, as well as Chris Cusiter, Kelly Brown, Jon Welsh, and captain Alastair Kellock.

Lineen added: “We have to take what happened last week on the chin. We’ve had two good wins at home but that’s not to say we don’t have to work for another.”