United have had two bids turned down for the 25-year-old and are understood to be weighing up a third.
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According to The Standard, he is starting to grow increasingly frustrated with the situation but still has his heart set on a move to Old Trafford.
Brentford believe they’re in a fantastic position to demand £62.5 million from Man United for one of their best players, pointing to Noni Madueke and Anthony Elanga as similar profiles.
Chelsea are understood to want £50 million from Arsenal for Madueke, while Nottingham Forest recently accepted a £55 million offer from Newcastle for Elanga.
Both players scored fewer goals than Mbeumo combined (17) last season, with the Cameroon international bagging 20 in his 42 games across all competitions.