The Belgian has been a revelation for Everton this season.
"It's not a bad idea and a way at looking at things from Chelsea's perspective," Jagielka told the Daily Mirror.
"Unfortunately for Rom, with Chelsea mainly playing one up front, he had a big decision to make whether to stay there and play five or 10 games a season or do what he did when he went to West Brom last season.
"I think he made the right decision. That's already been proven and we're only a third the way through the season.
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