Who knows, the possibilities are numerous. Imagine if he said something that got the veterans upset. Like I train much harder than these old guys and they start every game and I'm rubbing the bench.
I would be hesitant to believe even the Pjanic rumors that he's crap physically that's why he doesn't start. These things aren't believable when you see guys like Busi and Lenglet playing every game almost.
From Koeman's feud with Joaquin:
The first big incident between Koeman and Joaquin had a special guest: Ever Banega. The Argentine midfielder, who had joined in January, turned up to training late and wasn't in the best condition. Even so, Koeman named him as a starter at the weekend.Days later, Joaquin arrived late to training by 15 minutes. The Andalusian said that it was because of a problem with his car when leaving his children at school, but Koeman opted to make him watch the next game from the stands. From there, things only got worse.Joaquin treated David Albelda, Miguel Angel Angulo and Santiago Canizares as more than teammates. They were among his closest friends. This made Koeman's blood boil, and on more than one occasion the relationship between the two became tense, with Vicente Rodriguez also involved. But, of course, Vicente's character was not that of the more jovial Joaquin, although things were not going well and Koeman wrote that down in his notebook.
In spite of the absence of Angulo, who was away from the team and was competing with Joaquin for a spot in the line-up, Koeman decided to play Javier Arizmendi, who had rarely played as a winger, in order to leave Joaquin on the bench.The problem was that Valencia were struggling and did not win a single game, but even then Koeman didn't want to give minutes to the now-Real Betis captain. The climax of the conflict came in the Copa del Rey final against Getafe at the Estadio Vicente Calderon. Joaquin did not start, something he expected, but the Dutchman went so far as to get the midfielder to warm up in the first half and the entire second half, yet he never brought him on.
Seems like Koeman needs to find victims in the team to blow off steam. I hate managers who are super strict with some players, while other can do what they want that the start all the time. Double standards are a good way to fuck up a locker-room.
Same thing is shaping up at Barca. He strict with some players, and with others they can do what they want.