West Ham won’t believe what a Saints star said about them at their promotion party after returning to the Premier League. Southampton are back in the top flight after winning the play-off final but West Ham got a mention at their celebrations. The Hammers had a vested interest in the outcome of Saints’ Championship play-off final against Leeds. That being central midfield ace Flynn Downes. Southampton will earn an estimated £120m being back in the big time. And that’s the kind of figure West Ham look set to have to spend to make the eight or nine signings needed as part of Julen Lopetegui’s ov…