Los Angeles Lakers guard Steve Nash may have played his last game in the NBA after being ruled out of the upcoming season because of a recurring back problem. The Lakers said Nash, 40, who has been strongly tipped to retire after the 2014-15 campaign, had been sidelined after meeting with team doctors who advised him to sit out the season. "As disappointed as we are for ourselves and our fans, we're even more disappointed for Steve," said Lakers general manager Mitch Kupchak on Thursday. "We know how hard he's worked the last two years to try to get his body right for the rigours of the NBA, and how badly he wants to play, but unfortunately he simply hasn't been able to get there up to this point in time.