Christian Pulisic, the 22-year-old has been out of action since pulling up a hamstring issue in the warm-up before the Blues' win over Burnley in October.
He had previously been out for around two months after tearing his hamstring in the FA Cup final defeat to Arsenal, in which Pulisic scored the opening goal.
The international break set the USMNT to play their first fixtures since February, with friendly matches of Wales and Panama.
is in camp and is listed as day-to-day," Berhalter said.
"It really says a lot aboutChristian
that he wasn't playing forChelsea
but he wanted to come into this camp and be around the team and his status is day to day."
Meanwhile, Berhalter was also happy to welcome Juventus midfielder Weston McKennie back to the squad, though he won’t have Josh Sargent at his side for the future games due to the current coronavirus restrictions.
"With Weston, we were able to get him out of Italy and the situation is changing by the hour,” Berhalter said.
“Josh Sargent wasn't able to join the team but Weston is able to come.”