LAFC defender Walker Zimmerman will miss the United States' Nations League games against Cuba and Canada after getting sustaining a head injury.
He was replaced in the U.S. squad on Monday by Atlanta defender Miles Robinson, who was originally scheduled to spend this week with the U.S. Under-23 team.
Jozy Altidore has also been forced to withdraw after picking up an injury in the 70th minute of Toronto's season-ending win over the Columbus Crew. U.S. Soccer did not name a replacement for Altidore, whose status for Toronto's MLS Cup playoff match against D.C. United on Oct. 19 is unknown at this point.
Zimmerman is still being evaluated and his status for LAFC's first MLS Cup playoff game in the Western Conference semifinals on Oct. 24 is unknown at this time.
The injury marred an otherwise outstanding day for the Supporters' Shield winners, with the win giving them the most points in a Major League Soccer regular season and Carlos Vela scoring a hat trick to
The Americans play Cuba on Friday in Washington, D.C., then meet Canada four days later in the Americans' first foray into the all-new CONCACAF Nations League competition.
They host Canada on Nov. 15 in Orlando, Florida, in the next round of Nations League games and play Cuba four days after at George Town, Cayman Islands.
Revised U.S. roster:
Defenders: Reggie Cannon (Dallas), Nick Lima (San Jose), Aaron Long (New York Red Bulls), Daniel Lovitz (Montreal Impact), Matt Miazga (Reading), Tim Ream (Fulham), Miles Robinson (Atlanta), DeAndre Yedlin (Newcastle)
Midfielders: Brenden Aaronson (Philadelphia), Michael Bradley (Toronto), Sebastian Lletget (LA Galaxy), Weston McKennie (Schalke), Christian Pulisic (Chelsea), Cristian Roldan (Seattle), Wil Trapp (Columbus), Jackson Yueill (San Jose)