The talented winger is a target for new Gers manager Russell Martin.
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However, the Daily Mail says a first approach has been rejected by Palace management.
Rangers won't give up and is ready to try again in the coming days for Rak-Sakyi.
For his part, Palace manager Oliver Glasner is undecided over whether to keep Rak-Sakyi or allow him to move on.
The youngster has played ten senior games for Palace.