The 25-year-old took over 100 wickets between 2007 and 2008 but has struggled to recapture that form over recent years, and he only played a minor role as Yorkshire were promoted to the County Championship Division One last season.
However, Rashid believes that skipper Gale is partly to blame for his loss of form.
"I've been playing here seven years and I want to stay, but I have a career and I can't waste another year," he told The Independent. "If I don't feel as though I've been treated well, I'll go. It's hard to come straight on and hit your length and line with every delivery if you're hardly bowling and the coaches and people around you don't give you the backing.
"[Michael Vaughan] used to set defensive fields and just bowl me. He never doubted me and it would just build my confidence, I'd get a wicket, get another, get four, get five.
"With Galey it's changed. A couple of overs and that's it, you're not bowling again for a long time, and when you do come on to bowl again, it's for an over. I don't think it's fair."
Rashid has made 10 limited-overs appearances at international level.