my bike currently has a combination of 50X34 crankset and an 11x32 cassette and it looks like my rear derailleur is a long cage. I'm buying new wheels and I want to take the opportunity to try and buy a more compact cassette, maybe an 11x30 or 11x28. My question is, will I have problems with my current derailleur? Do I need to make some modifications?

Thanks in advance