The Saints striker will remain on loan at the JJB Stadium until the end of the season.
"Harry (Redknapp) has done us a big favour and allowed Brett to stay with us for another month," Wigan boss Paul Jewel told his clubs official website.
"They have a recall clause to take Brett back at any time, but hopefully for us he can stay, as the lad has bags of energy and enthusiasm and has done well for us."
"Harry (Redknapp) has done us a big favour and allowed Brett to stay with us for another month," Wigan boss Paul Jewel told his clubs official website.
"They have a recall clause to take Brett back at any time, but hopefully for us he can stay, as the lad has bags of energy and enthusiasm and has done well for us."