Cesc Fabregas believes one Manchester City player has found the missing piece to his game this season. Manchester City are going great guns having stretched their unbeaten streak to 20 matches with a 3-1 win over FC Copenhagen in the Champions League on Wednesday. But all that hard work might count for little if Pep Guardiola’s side fail to beat Liverpool on Sunday in a potential Premier League title decider against Liverpool. City will need all their players performing at their highest level and may once again look for Phil Foden to provide a match-winning contribution. The 23-year-old scored…