By Richard Martin BARCELONA (Reuters) - Lionel Messi will be out of action for three weeks after the Barcelona talisman suffered a groin injury in Wednesday's 1-1 draw with Atletico Madrid, the Spanish champions said. The five-times world player of the year limped off in the second half of Barca's La Liga match at the Nou Camp, moments before the visiting side equalized. "Leo Messi has torn the groin muscle in his right leg. More...