Bayern Munich playmaker and Manchester United target Toni Kroos was involved in a touchline bust-up with manager Pep Guardiola last night, it has been claimed.
According to reports from The Daily Express, the German international reacted angrily to being substituted for compatriot Mario Gotze with 16 minutes remaining during the 1-1 draw at Old Trafford, looking very unhappy and appearing to want answers from his boss.
It was a night of high emotion in the first of two meetings between the sides in the Champions League quarter-finals.
Despite Bayern dominating possession during a one-sided first half, Manchester United - who now must win the Champions League in order to qualify for the tournament next year given their domestic struggles - took the lead against the run of play shortly before the hour-mark thanks to a thumping header from outgoing captain Nemanja Vidic.
Guardiola's side restored parity just eight minutes later, however, with club stalwart Bastian Schweinsteiger coolly slotting home from a Mario Mandzukic knockdown.
The midfielder's joy was rather shortlived as he received a second yellow card in the closing stages for a foul on Wayne Rooney.
Quite what - if any - impact Kroos' seeming unhappiness at his manager's decision could have on Manchester United's apparent interest in the player or indeed his thinking over signing a new contract at the Allianz Arena remains to be seen.
It is worth noting, though, that this is not the first time that Kroos and Guardiola have not seen eye-to-eye during the heat of battle. In a similar situation back in January, the pair looked to have a disagreement during a Bundesliga clash against Stuttgart.
However, any possible fractures in the relationship between Kroos and his manager should surely be regarded as a boost for Manchester United - who some suggest could look to pay as much as £50 million for his services - in this instance.