Matteo Guendouzi says he needed to leave Arsenal to have fun, having been hurt by a lack of playing time in north London.
Guendouzi was exiled from the Arsenal squad after clashing with Neal Maupay following a 2-1 defeat to Brighton in June.
The Frenchman fell out favour under Mikel Arteta despite escaping punishment from the Football Association for grabbing Maupay by the throat, and was eventually sent out on loan to Hertha Berlin in October.
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The 21-year-old has since appeared in three games for the Bundesliga side, with his latest outing coming in a 5-2 defeat to Borussia Dortmund on Saturday.