* Riquelme to start training on Monday * Re-unites with successful coach (Adds details, quotes) BUENOS AIRES, Feb 8 (Reuters) - Boca Juniors have welcomed back midfielder Juan Roman Riquelme seven months after he walked out of the club due to differences with former coach Julio Cesar Falcioni. "After two and a half hours with Riquelme, the board has decided unanimously that given the player's will to resume training with the squad he should be part of (Boca's) professional squad from Monday," club president Daniel Angelici told a news conference on Friday. ... More...