By Katie Catherall Southampton marched firmly back into the Premier League on Sunday after defeating Leeds United in the Championship play-off final. The Saints’ success granted another southern team a spot in the top-flight, with manager Russell Martin preparing for his first season in the top flight. But their success may attract the eyes of rival clubs as the summer transfer window opens. Here are five Southampton players that Premier League clubs should look out for. Adam ArmstrongIt was Adam Armstrong’s goal at Wembley that guaranteed Southampton’s promotion back into the Premier League. …