The New Orleans Saints claimed quarterback Joe Callahan off waivers eight days ago, and it appears they are set to also waive him, according to Mike Garafolo. The Green Bay Packers signed Callahan as a UDFA, and he impressed in training camp. They waived him to clear a roster spot, and hoped to sign him to their practice squad.
I do not believe the 49ers placed a waiver claim on Callahan a week ago, given that they would have had better waiver priority than the Saints. That would suggest they will not make a claim on him in the coming days, but I suppose anything is possible.