The trequartista has not been seen since being replaced in the Champions League defeat by Barcelona at Camp Nou, while the Brazil centre-half has been out of action since March 24.AC Milan have received a timely boost with the return to training of key duo Kevin Prince-Boateng and Thiago Silva.Boateng has been plagued by muscular problems this season and has not featured for the faltering Rossoneri since coming off midway through the second half of their Champions League quarter-final second-leg defeat by Barcelona at Camp Nou earlier this month.Thiago Silva, meanwhile, missed both games against the Blaugrana after aggravating an existing thigh problem in the opening minutes of the Serie A clash with Roma on March 24However, both men were included in Monday\'s session at Milanello, putting the pair in contention to make their eagerly-awaited comebacks in Wednesday\'s must-win encounter with Genoa at San Siro.The Rossoneri have struggled without Boateng and Thiago Silva and Sunday\'s draw with Bologna, coupled with Juventus\' rout of Roma later in the day, means Massimiliano Allegri\'s men now trail the Bianconeri by three points in the race for this year\'s Scudetto.