TROUBLED Hong Kong First Division club Rangers may be forced to field all four of their foreign players for this weekend's President's Cup - including departing goalkeeper Mark Walton and defender Steve O'Shaughnessy. Walton and O'Shaughnessy were supposed to have left the territory last night after the club agreed to release them a week short of their one-month contract. But the saga took a new twist yesterday when the Hong Kong Football Association (HKFA) advised the pair to fulfil their short-term contract which runs until the end of the month. So far Walton and O'Shaughnessy want to part company although Rangers' other foreign players, central defender Mark Blake and former under-21 England striker Gary Bannister, may be offered season-long contracts. Rangers' team manager Philip Lee Fai-lap said: ''We have been told by the HKFA that all the players must fulfil their contracts.'' Ex-West Ham forward Bobby Barnes, the first foreign player to leave Rangers after only fulfilling two weeks of his contract, has written to the club stating he wants to return. Meanwhile, respected coach Cheung Chi-doy has joined another troubled Hong Kong club - Kitchee - from Kui Tan.