Ross Wallace was born 23 May 1985 in Dundee. Wallace is a product of the Celtic youth academy and made his breakthrough into the first team in the third round of the Scottish League Cup in October 2002 when he came on as a substitute for Didier Agathe in the 68th minute, having only signed professional terms with the club just months before.
Wallace made his European debut in the Champions League second qualifying round tie against FBK Kaunas of Lithuania in August 2003, which the Hoops won 1-0. Wallace also scored his only league goal for the club during the 2003/04 season in a 5-0 victory against
The 2004/05 campaign saw Wallace make 21 games in all competitions and scored three goals - a hat-trick in Celtic's 8-1 League Cup drubbing of
Such was his promise this season that manager Martin O'Neill dismissed any talk of him being loaned to another team, saying the talented winger featured heavily in his plans.
Gordon Strachan clearly shared O'Neill's opinions, and played Wallace a further 14 times in 2005/06 Towards the end of the 2005/06 season, new signing Mark Wilson replaced him at left back even though it is not his natural position. Wallace did, however, play in the Scottish League Cup Final against Dunfermline at left back because
Wallace joined
He made his first team début on 9 September against Derby and scored the winner in a 2-1 win. His arrival on Wearside saw him keep the number 33 that he wore at Celtic. Wallace also scored the winning goal at Hull. On both occasions he removed his shirt after scoring, which at
Wallace scored 6 goals in 32 appearances as
He scored his first goal of the season against Reading at the Stadium of Light in a 2-1 victory for Sunderland, scoring again on a 3-2 loss to Arsenal scoring the first ever goal for Sunderland at their first ever game at the Emirates Stadium. On 18 January 2008 it was reported that Wallace had sustained an Anterior Cruciate Ligament knee injury and returned to the first team on the 1-0 defeat at home to Arsenal on 11 May 2008. He had scored 2 goals in 21 appearances during the season.
During the summer of 2008 Wallace rejected an offer from Preston so that he could fight for his place in the
Wallace signed a year long loan at