Juan Mata has signed a new contract with Manchester United until June 2021, with the option to extend for a further year. The Spaniard’s previous deal at Old Trafford was set to expire at the end of the month.United were reluctant to allow Mata to leave on a free transfer, having already seen Ander Herrera decide to run down his deal this summer ahead of a likely move to PSG, while club captain Antonio Valencia is also out of contract.United boss Ole Gunnar Solskjaer cited Mata’s professionalism and positive influence in the dressing room as key reasons for keeping him at a time when United appear to be in a period of transition after finishing sixth in the Premier League last season. Solskjaer said: “Juan is the ultimate professional and one of the most intelligent players I have worked with. He is a great example to our younger players in his approach.”He understands what it means to be a Manchester United player and has embraced everything about this great club. Listen to the latest episode of Transfer Talk: Is Lampard right for Chelsea?”As well as everything he brings on the pitch, we have some fantastic young players here and I…