Manchester United manager Louis van Gaal watched on as Arjen Robben and Bruno Martins Indi - two transfer targets of the newly-appointed Red Devils' boss - clashed during the Netherlands' most-recent training session.
The two players were training hard at their World Cup base in Rio de Janeiro and had clashed several times before Robben eventually lashed out. The world-class Bayern Munich winger had grown increasingly frustrated with the 22-year-old defender's forceful challenges and spitefully lashed out following a throw-in.
The incident was captured by Dutch journalists, who asked Martins Indi about the incident in a press conference later that day. The powerful centre-back confirmed that the reporter's eyes had not deceived him - and even accused his revered teammate of going to ground too easily.
"Arjen is a good dribbler. I thought he fell needlessly once," Martins Indi said. "We had a little head-to-head."
The Dutch national team have often experienced problems with in-fighting at major tournaments. Although these type of incidents will occur during the training sessions of every nation competing at the World Cup, this clash between Robben and Martins Indi just happened to be caught on camera.
Van Gaal is believed to be weighing up a move for both players for his new-look Manchester United side. The vastly-experienced 62-year-old will arrive at Old Trafford following the conclusion of this summer's World Cup finals in Brazil, which get underway on Thursday.
To watch the training ground incident, click play on the video at the top of the page - and don't forget to comment!