The midfielder was on Jose Mourinho’s wish-list for the summer as he looks to strengthen his squad ahead of the Premier League season this week.
Despite having signed Nemanja Matic from Chelsea, Spanish outlet Don Balon claim the Red Devils are set to bid for the Brazilian as he can play at right-back.
And amid the transfer speculation, the 23-year-old looked far from happy in training yesterday for the French outfit.
Footage posted to Twitter earlier today shows the player slowly walking across the pitch before ripping off his bib and throwing it to the floor.
He then appeared to kick a ball in frustration before the clip came to an end.
While there’s no indication what caused Fabinho’s apparent anger, many fans reached the same conclusion.
“Not too much commitment against Toulouse [Monaco’s last match] and that in training…I think Fabinho wants to leave,” one wrote.
Another referenced Neymar’s bust-up in a training session for Barcelona, saying: “The last time a player got angry in training, he signed to PSG.”
While a third added: “He’s not coming back is he.”
