Russell Martin has shed light on his thoughts regarding a vital position as Southampton gear up for a return to the Premier League. The Southampton boss has taken his players to Spain for a week of warm weather training where they will face two French sides in Bordeaux and Montpellier in pre-season friendlies. Russell Martin has already overseen his first friendly of the summer, as Southampton beat National League side Eastleigh 7-1 on Friday night. One point of interest that night was the goalkeeper situation, with Alex McCarthy and returning loanee Mateusz Lis playing half each and Joe Lumle…