Wales are away to Macedonia in a World Cup qualifier on Friday before hosting Serbia at Cardiff City Stadium the following Tuesday.
"He has not done much work in the last six weeks or two months. His last training session was with us before the Republic of Ireland game," Coleman added.
"Is he going to start on Friday? I think that may be a doubt [but] that's not to say he can't play a part though," Coleman added.
I've followed Real all my life - Bale
"We'll see how the next two or three days go in terms of where he is physically and mentally because it's been very draining on him. The main thing is, he's here.
"We are aware a lot of people will want to see him play in the home game against Serbia. But he has no chance of playing 90 minutes on Friday or on Tuesday."
Coleman praised Bale's new employers Real Madrid for allowing the winger to his national side at their base in Cardiff.
Bale is expected to make his Real Madrid debut against Villarreal on 14 September when La Liga resumes following the international break.
"Credit to them, they have not put any barriers in front of him and there hasn't even been a conversation. They've allowed him to come back," Coleman said.
"I know Carlo Ancelotti's right-hand man Paul Clement very well, he coached with me at Fulham, so that can help us going forward when I go out there to speak to them."
Wayne Hennessey (Wolverhampton Wanderers - on loan at Yeovil), Boaz Myhill (West Bromwich Albion), Owain Fon Williams (Tranmere Rovers), Ben Davies (Swansea City), Paul Dummett (Newcastle United), Danny Gabbidon (Crystal Palace), Chris Gunter (Reading), Declan John (Cardiff City), Adam Matthews (Celtic), Sam Ricketts (Wolverhampton Wanderers), Ashley Williams (Swansea City), Andy King (Leicester City), Joe Ledley (Celtic), Aaron Ramsey (Arsenal), Jonathan Williams (Crystal Palace), David Vaughan (Sunderland), Jack Collison (West Ham United), Andrew Crofts (Brighton & Hove Albion), Sam Vokes (Burnley), Craig Bellamy (Cardiff City), Simon Church (Charlton Athletic), Hal Robson-Kanu (Reading), Gareth Bale (Real Madrid).
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