The 31-year-old impressed for the Saints last season, scoring 15 Premier League goals as his side finished 14th in the league table.
England squad to face Scotland on August 14:
Goalkeepers: Ben Foster, Joe Hart, John Ruddy
Defenders: Leighton Baines, Gary Cahill, Ashley Cole, Phil Jagielka, Glen Johnson, Phil Jones, Chris Smalling, Kyle Walker
Midfielders: Michael Carrick, Tom Cleverley, Steven Gerrard, Frank Lampard, Jack Wilshere. James Milner, Alex Oxlade-Chamberlain, Theo Walcott, Ashley Young, Wilfried Zaha,
Forwards: Jermain Defoe, Rickie Lambert, Wayne Rooney, Danny Welbeck