Jose Mourinho warns Man Utd cannot weaken rivals by buying their best players

Juan Mata was the last player Manchester United signed from a top-four rival

Jose Mourinho says the days of Manchester United raiding their rivals for their best players are gone
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Sixth-placed United have the chance to close the gap on the top four when they face Leicester on Sunday, live on Nissan Super Sunday, after Arsenal and Liverpool lost on Saturday, but Mourinho has warned their return to the top of English football will take more time.
In the past, United have signed Robin van Persie from Arsenal, Dimitar Berbatov from Tottenham and Andy Cole from Newcastle, but they have not bought a player from a top-four rival since signing Juan Mata in January 2014 when he was no longer in Mourinho's plans at Chelsea.