MADRID, Jan 26 (Reuters) - Swedish fashion retailer H&M announced on Friday a plan to close down 28 stores in Spain, home of its rival Inditex, and lay off as many as 588 workers, Spain's CCOO union said in a statement.

The negotiations with the unions are due to start in September, it added.

H&M did not immediately respond to a request for comment. (Reporting by Inti Landauro, editing by Andrei Khalip)