The Telegraph newspaper reported that Koepka and Johnson - nicknamed the Bash Brothers for their big hitting - clashed after they were invited to Europe's team room on Sunday following the 10.5-17.5 defeat at Le Golf National in France.
Rory McIlroy might be sitting out the first FedEx Cup Playoff event to address issues in his game but Brooks Koepka is gunning to add another win to his stellar bid for Player of the Year honours at The Northern Trust in New Jersey.
Brooks Koepka has denied getting into a fight with Ryder Cup teammate Dustin Johnson and has defended the camaraderie of the USA team as "perfect". He says the two have never raised their voice at each other. "I could not speak with you", she said.
"No one feels worse about this than I do".
"We were sleeping. It's just laughable. When I got here and I had seven missed calls and 25 text messages I was like, 'What is going on?'" "My stomach sank. It's sad and I'm really torn up about it".
"It's a tragic accident what happened and I'm heartbroken, I'm all messed up inside".
Europe captain Thomas Bjorn told Press Association Sport: 'For me, the whole team I represent and everybody at Ryder Cup Europe, it's just a awful thing and something that you don't want to happen.
"I have nothing against the player [Koepka] because I play golf and I know golf".
"It's actually quite amusing to us as we are really good friends and there was no argument, no fight". How could we get into a fight on the flight over? I'd be curious, though, who would win in a fight. We're two even-keeled guys and I can't even remember raising my voice to him or him to me in our four years of friendship.
"There are many marshals on the fairways and they have the responsibility to give us the information to react", Remande told BBC News.
'I tried to stay positive with him so that he didn't lose his concentration, ' she said.
"I probably spent an hour during my round on the phone trying to understand what was going on because it's hard to get the real story of what's going on, because I didn't know if it was fake or not". If I won those, if Tiger wins his; Dustin lost one with me and then I think lost in the singles.