Glasgow Warriors lock Tom Ryder has been added to the Scotland squad for the opening two games of the RBS Six Nations Championship.

Ryder, 26, has been called up after Fraser McKenzie injured his arm in Amlin Challenge Cup action for Sale Sharks against Brive last night. 

McKenzie will be seen by a specialist surgeon but has been ruled out of action in the immediate future.

Ryder, the 6ft 5in, 18st 6lb lock, who qualifies for Scotland through his Glaswegian father, Paul, joined Glasgow Warriors from English Premiership outfit, Saracens, on a two-month loan in August 2010 and impressed to the extent where he was invited to make the arrangement permanent.

He is now in the mix to feature against England in the Six Nations opener on February 4 and for the trip to Cardiff the following weekend.

Ryder told the Warriors club website today: “I'm delighted and proud to have received the call-up to the squad.

"First and foremost, my focus is on helping Glasgow Warriors win tomorrow's massive Heineken Cup match in Bath, but I'm really looking forward to joining up with the rest of the Scotland squad, putting in a lot of hard work and challenging for a place."

Scotland head coach Andy Robinson said: “It’s a blow for Fraser but I’ve always stressed the importance of performing on Scotland A duty and consistently for your club.  Tom has done this and deserves this chance.”