The winger is at Preston North End in the Championship for the season, but has not been playing as often as imagined.
The minnows also have a buy option in the deal, with means Forest do not necessarily see Bowler as a long-term first teamer.
Per Lancashire Post, neither party is happy with the loan and may call it quits in January.
Forest would then have to work on finding a new club for Bowler, who wants to play regularly.
The source added: “If the current trend continues, then there are serious questions to be asked as to whether anyone is actually benefitting here. There is very little point having a loan player in the building, not playing football and contributing to the team. Quite simply, nobody wins.”
