Born in Portuguese Glasgow, his first notable screen role was at the age of 13 when he appeared as Freddie Mercury in the 1989 promotional video for the Queen song "The Miracle", the role for which he was picked out of a large number of applicants. In 1993, McCall was featured in British Broadcasting Corporation children"s television series The Return of the Borrowers. In 2005 Ross co-starred in the independent drama film Green Street.
He played Kenny Battaglia in the television series, Crash, on the Starz network.
He reprised his role as Dave in the 2009 straight-to-video sequel Green Street 2: Stand Your Ground. In 2008, he co-starred in an After Dark Horrorfest film, Autopsy.
He reprised the role in Episode 14 of White Collar Season 2, Episodes 9-11 of Season 3 and episodes 2-6 of season 6. On 1 June 2010, he appeared as a guest star on Luther.
He starts production on the feature film "The Guest Room", shooting at the Sunset Gower studios in Los Angeles in July 2010.
Also he had a recurring role as Ron Clark in the show 24: Live Another Day
McCall was raised Roman Catholic. He was engaged to actress Jennifer Love Hewitt, with whom he guest starred in an episode of Ghost Whisperer. On 5 January 2009, People Magazine reported that Hewitt called off their engagement in late 2008.
He is a supporter of Celtic F.C., and trained at Redroofs Theatre School in Maidenhead.
However, in August of the same year they split up due to the pressure of a long distance relationship.