West Brom have completed the signing of Georgios Samaras, but the Greek international forward will not be involved against Saints tomorrow.
The 29-year-old, who had been linked with a move to St Mary's at one point this summer, has joined the Baggies on a free after being released by Celtic.
West Brom confirmed today, however, that he will not be involved this weekend.
Central defender Joleon Lescott is also unlikely to make his debut, despite returning to training after a knee injury.
Cristian Gamboa will not be considered to face Saints either, with Albion boss Alan Irvine eager to give the right-back more time to settle after his £2m move from Rosenborg.