Sounders striker Clint Dempsey training again after heart scare

This combination picture made on June 24, 2014 of two file pictures shows Germany's defender Philipp Lahm (L) playing the ball during the friendly football match Germany vs Armenia in preparation for the FIFA World Cup 2014 on June 6, 2014 in Mainz, central Germany and US Clint Dempsey (R) controlling the ball during the friendly match between Turkey and the United States June 1, 2014 at Red Bull Arena in Harrison, New Jersey. Germany will play against US in a Group G football match at the Pernambuco Arena in Recife during the 2014 FIFA World Cup on June 26, 2014. AFP PHOTO / DANIEL ROLAND - DON EMMERT

Seattle Sounders forward Clint Dempsey has returned to training after being diagnosed with an irregular heartbeat last month but has not yet been cleared to play again for the Major League Soccer club.

The former Tottenham Hotspur and Fulham striker, the only player to score in three World Cups for the United States, underwent medical checks last week.