West Brom have sacked Nicolas Anelka citing "gross misconduct" after the striker claimed on Twitter he had quit the club.
Mauricio Pochettino expects to be at Southampton next season and is looking forward to working with chairman Ralph Krueger.
Motherwell have signed Faroe Islands goalkeeper Gunnar Nielsen.
The 26-year-old, who spent six months on loan at the SPL club in 2008, arrives from Danish club Silkeborg on a two-year deal.
Nielsen counts Blackburn and Manchester City among his former clubs and will challenge Lee Hollis for a first-team place at Fir Park.
He told the Motherwell website: "I'm delighted to be back and having been at some big clubs where it was hard to get a game, I can't wait to get playing again.
"I know Motherwell well from my six months here before and I know it's a great club to be at.
"I'm really pleased to get this sorted and am looking to establish myself as No 1 and do really well.
"We finished second last season and if we can do that again it would be a great achievement."