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OM said in a statement on their website that English midfielder Barton and French defender Abdallah had a "verbal clash" during a public training session, without elaborating.
"During my career, I've seen 30 or 40 clashes on a training pitch," Barton told OM TV.
"These clashes should be dealt with in private. We are competitors... and sometimes we go a little bit too far. The most important thing is to make peace and move on - that's what happened yesterday."
"It's certain that where I am, there is always a little bit more noise and exaggeration," Barton said. "I'm aware of that, that's why I said yesterday: 'let's stop it, calm down. If there's a problem, let's deal with it in private'."
