The American forward sustained a hamstring injury in the first group match but could return for the round of 16 match.
United States star Jozy Altidore is set for a World Cup return on Tuesday against Belgium in the round of 16, according to a tweet from the official U.S. Soccer account.
"We need to see how things are going, but he's available," Klinsmann said with a laugh at a news conference. "This is what we want, this is what we hoped for. This is what the medcal staff is working since the injury on him, and they've done a tremendous job. They've worked day and night with Jozy. So just having him with us tomorrow is huge. How many minutes? We'll see that during the game."
The forward has been unable to play since he pulled up with a hamstring injury
while chasing a long ball in the Americans' tournament-opening victory against Ghana. Altidore traveled but did not dress for group matches against Portugal and Germany as he recovered.
The 24-year-old started running during training again
last week and participated in the open portion of Monday's session.MORE: Worst hairstyles | Beautiful people in Brazil
Clint Dempsey has played as the lone striker in the Sunderland man's absence, but while Dempsey has performed well, Altidore's athleticism and physicality has been missed by Jurgen Klinsmann's side.