Manchester City fears Rodri could miss the remainder of the season with a serious knee injury in a major blow to their Premier League title defense.<br /><br />Pep Guardiola's metronome was forced off 21 minutes into Sunday's tempestuous 2-2 draw with Arsenal at the Etihad Stadium.<br /><br />Rodri fell into a heap clutching his right knee after falling during a run alongside Thomas Partey to meet a corner and was helped off the pitch by medical staff.<br /><br /><br />Tests undertaken on Monday uncovered the severity of the injury and a further round of examinations are expected to confirm that Rodri is set for months on the sidelines.<br /><br />The Spain international will visit Dr Ramon Cugat in Barcelona for treatment and his absence will be acutely felt by Guardiola, who has built his foundations around the central midfielder.