Keane suffered a foot injury during the England youth team's game against San Marino and the move may be cancelled.
"I spoke to David Moyes on Wednesday," Coyle had told BBC Radio Manchester.
"Given the lad's had a serious injury, we'll always be guided by Manchester United in terms of when they feel is the right time for him to go out on loan.
"I think this week will be too soon, given the slight knock he had, but if he recovers from that and the medical team are happy with him, there's a possibility we could have that sorted by next week.
"We have a tremendous relationship and David has said he'll keep me up to speed."
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