Southampton are being linked with an audacious move for a Champions League winner if they are promoted to the Premier League. Russell Martin‘s side face Leeds United in the Championship play-off final on Sunday, with the winner securing an instant return to the top flight. It is likely to be a busy summer at St Mary’s regardless of promotion, but they could see the quality of player they can attract in the transfer window significantly increased if they are victorious at Wembley this weekend. Should they overcome Leeds for the third time this season, Martin and the Southampton hierarchy will h…