Mudryk signed for Chelsea last season ahead of Arsenal when leaving Shakhtar Donetsk.
Petit, who played for both clubs, told Wettfreunde: "There are also no guarantees that he would have prevailed at Arsenal.
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"But of course, the chances would have been greater because the squad there is better structured & there is significantly more stability."
Mudryk struck for Chelsea in their FA Cup win against Leeds in midweek.