Matteo Guendouzi is a "pain on a daily basis" to work with, according to his former boss Mickael Landreau.
The 21-year-old was with Lorient as a youth player before making his debut in 2016. His time at the club would overlap with Landreau's tenure in charge, as the former Paris Saint-Germain goalkeeper was head coach between 2017 and 2019.
They spent a season together before Guendouzi moved to Arsenal.
Despite impressing on occasion at the Emirates with his tenacity in midfield, he was eventually shipped out on loan to Hertha for the 2020/21 campaign, with reports emerging of a poor attitude and a clash with manager Mikel Arteta.
Landreau admits he can he difficult to deal with, though did praise his talent.
"He annoyed me terribly, he is very complicated to manage," he told Canal+.
"He sometimes has some behaviours within a group that are very, very hard, but somehow, that's what he is, a big character.
"He doesn't let go, he is a fighter. He has an oversized ego, but he certainly needs it. I think he needs to be in the spotlight, to be a leader. He needs to be a captain or vice-captain, and he will try to make the most of it.
"That's the way he is, and that means that his teammates have to accept him the way he is, because he's a pain on a daily basis. He's a pain on a daily basis, but on the other hand, he's talented."
After becoming involved in a tussle with Neal Maupay, he allegedly made disparaging remarks to several Brighton players with regards to their level of wages compared to his own.