Eric Bailly openly questioned Ole Gunnar Solskjaer's decision to start Harry Maguire against Leicester City, reports have claimed.
The Ivory Coast international was expecting to get his chance against the Foxes with Maguire struggling with a calf injury.
Despite training once before the match, Maguire started and performed miserably as United went down 4-2.
According to The Telegraph, Bailly talked to Solskjaer about his decision and asked the Red Devils boss 'why he picked a centre-half who was not fit'.
Some players have accused Solskjaer of having favouritism with some players, as well as questioning why he hasn't picked Donny van de Beek and Jesse Lingard.
The Norwegian is under pressure to keep his job after United were embarrassed 5-0 by Liverpool.
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