American Christian Pulisic controls the ball during a World Cup Group D against Paraguay in Inglewood, Calif., on Friday. (AP photo)

IRVINE, Calif. — Christian Pulisic trained apart from his U.S. teammates on Wednesday for the third straight day because of his calf injury, increasing concerns about his availability to face Australia on Friday in the Americans’ second game of the World Cup.

Pulisic played a dynamic first half in the Americans’ 4-1 victory over Paraguay last week, but came off at halftime after feeling stiffness from a calf injury incurred in training. He hasn’t worked out with his teammates this week at their training base in Orange County, instead doing individual work largely in the gym.

Pulisic didn’t work out on the grass at all Tuesday, but the AC Milan attacker took the field at Great Park with trainers and did ball drills on Wednesday. He tested out his left leg while wearing a compression sleeve on his calf during the 15 minutes of practice open to media.

“We’re really hoping that Christian is going to be back for the game, of course,” said Brenden Aaronson, one of Pulisic’s potential replacements. “I don’t really know what’s going on in particular, but we know that he’s going to give us his all to get back in the team and be there for the game, so we’ll see. We’re really excited to see what the deal is.”

Pulisic is the U.S. team’s most accomplished player and the lynchpin of their offensive attack. His playmaking and ball skills down the left side led directly to Paraguay’s own-goal in the opening minutes last Friday, and he added an assist on Folarin Balogun’s first goal.

His absence could hinder a team coming off its nation’s highest-scoring World Cup performance with a wave of momentum early in its home World Cup. But Pulisic’s teammates are confident he’ll do everything possible to play — and they also feel the team’s depth could sustain them in this potentially physical matchup with the Socceroos in Seattle.

“We’ve still got a couple of days to see where he’s at,” U.S. left back Antonee Robinson said. “Thankfully we’ve got a lot of boys on the bench who are eager to get involved with helping the team with a lot of quality. It’s a long tournament. If we don’t have (Pulisic) for the game, then we need to make sure we have him for the rest of the way, because we’re going to need him. We’re going to need everyone. But hopefully we have him (Friday).”

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AP World Cup: https://apnews.com/fifa-world-cup