The Saints signed veteran quarterback Jamie Martin on Thursday and also have shown interest in trading for Green Bay Packers receiver Javon Walker. Walker, 27, came to New Orleans for a physical Thursday. The Packers, however, reportedly are very reluctant to trade the former Pro Bowl selection unless some team offers a deal they cannot refuse. Walker, who has one year remaining on his contract, has demanded a trade this offseason and has threatened to retire if Green Bay doesn't let him play elsewhere. Until recently, the Packers refused his request, but this week they allowed him to meet with other teams. Walker reportedly visited the Denver Broncos after leaving New Orleans. "I don't think the odds are in favor of (a trade)," Green Bay general manager Ted Thompson told the Milwaukee Journal-Sentinel on Thursday. "We're just following up on some things. I don't necessarily feel it will end up in anything. We're going through the process."