ROME — Michael Phelps' coach has threatened to withhold the swimmer from international meets until FINA bans high-tech bodysuits.

Swimming's governing body, FINA, upheld a decision Tuesday to outlaw the suits next year, although the ban might not take effect until April or May — three or four months later than expected.

Told of the possible delay, Phelps' coach, Bob Bowman, said FINA better "do something or they're going to lose their guy who fills these seats."

Bowman spoke immediately after Phelps was upset by unheralded Paul Biedermann of Germany in the 200-meter freestyle at the world championships. Biedermann wore a 100 percent polyurethane Arena suit, while Phelps stayed with last year's LZR Racer from Speedo.