Scotland have added Fraser Brown and Murray McCallum to their Six Nations squad ahead of the clash with Ireland on Saturday.

Hooker Brown was able to take part in non-contact training last week as he steps up his recovery from a knee injury.

Brown was expected to train fully on Monday, while prop McCallum has been drafted in by Gregor Townsend after Willem Nel suffered a calf strain in the victory over Italy on Saturday.

McCallum was given a third cap against the United States last June, having made his debut in the Six Nations thrashing at the hands of Wales in Cardiff 12 months ago.

Forward Sam Skinner has returned to Exeter Chiefs for assessment after damaging his ankle in the 33-20 win over the Azzurri at Murrayfield.

SQUAD UPDATE | Head Coach Gregor Townsend today added front-row pair Fraser Brown & Murray McCallum to Scotland's 2019 Guinness Six Nations squad.

Exeter forward Sam Skinner has returned to his club for further assessment on his injured ankle.

https://t.co/jSsYp4eo5W pic.twitter.com/XpbVs6X5bR

— Scottish Rugby (@Scotlandteam) February 4, 2019