James Maddison
Maddison joined the Foxes from Norwich City during the summer and commanded a £22m fee when moving to the Midlands.
Saints were also said to be interested in the attacking-midfielder, but it was reported that he chose Leicester to be based closer to his family.
A clever player who can play between the lines and deliver a mean set-piece, the 22-year-old has five goals and three assists in 19 Premier League appearances so far this season.
It will be vital that Saints don’t let him receive the ball in space outside the box to limit the effectiveness of both his shooting and pin-point passing.