Barcelona star Lionel Messi took part in light training on Thursday after being stretchered off with a knee injury during the 0-0 draw at home to Benfica in the Champions League. \"Leo Messi who played last night worked out in the weight room today,\" read a club statement on their website as fears about the seriousness of the Argentine\'s injuries began to wane. \"Messi was the victim of a bruise on the outside of his knee and will undergo further tests to determine the exact damage,\" said the club. Messi came on in the 58th minute against Benfica in a match that was meaningless to Barcelona but was chasing his 85th goal of the calendar year which would have equalled Gerd Mueller\'s long-standing record. Early reports said the 25-year-old may be out of action for two weeks. Barcelona have three Liga matches before the end of the year, including a top of the table clash at home to Atletico Madrid on December 16, before their final match of the year on December 22 when they travel to Valladolid.