Rohl was a second-half substitute at home for the Blues after his late market arrival from SC Frieburg.
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Moyes said: “If you’re going to ask me to judge them after 20 minutes in a game, it’s really difficult.
"I am needing longer to see them, but what we have seen of him we like.
“I thought today, he came on, it’s never easy and you’ve got to remember Aston Villa are one of the best teams in the Premier League and have been for the last couple of seasons and our performance was good against a really good side.”