Tottenham boss Nuno admits Heung-min Son is out of their clash with Crystal Palace due to a calf problem.

Nuno is unsure how long he could be without Son, with doctors set to determine whether the injury will keep him out for the long term.

"Like some of our players, he came (back) with some issues," said the manager of the South Korea striker.

"Sonny is not so well, but let's wait for the club to make the proper announcement and explain to you better what kind of injury he has,' the Spurs boss said.

"I don't know (if it's long term). Let's wait and see. The doctors will make the proper diagnostics."

Son has scored twice in three games in the Premier League this season, including last time out in a 1-0 home win over Watford. He also scored the only goal of the game in Spurs opening day win over Manchester City.