The 32-year-old has an uncertain future at the club after a season-long loan spell at Tottenham Hotspur last year failed to materialise into a permanent transfer.
"Gareth hasn't played a lot [at Tottenham], but he has scored a lot of goals," Ancelotti said during his first press conference since being reappointed as head coach.
"I know him very well and he is coming back. If he has the motivation to play he can have a good season, I have no doubt."
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