United States defender/midfielder Tyler Adams has withdrawn from the Gold Cup with a groin injury, U.S. Soccer announced Tuesday.

FC Dallas defender Reggie Cannon has been tabbed to take his place on the roster.

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"Following further evaluation in New York City, the 20-year-old has been diagnosed with acute on chronic groin issues that will require a minimum of 6-8 weeks recovery period," U.S. Soccer said in a statement.

The announcement is a huge blow for U.S. manager Gregg Berhalter, who is feeling some heat following two poor performances in Gold Cup tune-up losses to Jamaica and Venezuela.

Adams was expected to take on a hybrid role in Berhalter's system, playing as a right-back, but stepping into central midfield when the U.S. is in possession. Yet the RB Leipzig man missed a six-week stretch from the beginning of April until mid-May due to an adductor injury, and though he returned for a pair of games at the end of the campaign, including Leipzig's 3-0 defeat to Bayern Munich in the DFB-Pokal final, he was deemed insufficiently recovered to participate in the Gold Cup.

Adams had been scheduled to arrive at the U.S. camp on June 11. Now Berhalter will have to cope without one of his most important players.

San Jose Earthquakes defender Nick Lima has filled the right-back/central midfield role in a few friendlies, but it remains to be seen if Berhalter will stick with the system when the U.S. opens the tournament against Guyana on June 18.

Meanwhile, Cannon, 21, has made two appearances with the U.S., but none under Berhalter.

He made his international debut in a 1-1 draw with Peru last October and followed that with another start against Italy a month later. Following his professional debut in 2017, Cannon has made 56 appearances for Dallas in all competitions, scoring one goal.