Just in case Michael Strahan is serious about retirement, the Giants are moving on, switching William Joseph to left defensive end and flirting with Simeon Rice. But most of Strahan's teammates don't believe he's serious. They think his return to training camp is only a matter of time. "My gut feeling is yes, he'll be back to play," linebacker Antonio Pierce said yesterday. "Maybe he just wants a week or two off. It's a little hot today. Maybe Mike is sitting at home sipping pi?a coladas thinking, 'OK, I'll give it another week and then I'll be back.'" "I wouldn't be surprised if you see him tomorrow," added defensive end Justin Tuck. "We're still approaching this camp and this season as though Michael will be our left end."