The former Manchester City marksman will miss the weekend's battle between top and second after picking up a muscle strain
Roma striker Edin Dzeko will miss Sunday's crucial Serie A clash with table-toppers Juventus due to a calf injury.
The fixture represents Roma's last chance to try to reel in Juve as Massimiliano Allegri's side will secure the Scudetto if the hosts fail to win at the Stadio Olimpico.
Bosnia international Dzeko's 27 league goals have helped the Giallorossi cling onto the coattails of the Turin giants all season, but a sixth-straight title looks on the cards for Juve, who are seven points above Roma with three games to play.