Atlanta United fullback Ronald Hernandez will miss at least four weeks of play after suffering an MCL sprain in his right knee during training on grass at the team’s facility Friday.

Atlanta United is scheduled to play Santos Laguna on Sunday in a must-win Leagues Cup match at Mercedes-Benz Stadium.

Hernandez has made 11 appearances, including six starts, this season. He has taken over at left fullback or wingback after the sale of Caleb Wiley to Chelsea.

With Hernandez out, interim manager Rob Valentino could select new signee Pedro Amador or Matt Edwards if he chooses a formation that includes two centerbacks and two fullbacks, or Amador, Edwards or Mosquera if he chooses three centerbacks with two wingbacks.

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Atlanta United’s 2024 schedule

Feb. 24 Columbus 1, Atlanta United 0

March 9 Atlanta United 4, New England 1

March 17 Atlanta United 2, Orlando 0

March 23 Toronto 2, Atlanta United 0

March 31 Atlanta United 3, Chicago 0

April 6 Atlanta United 1, NYCFC 1

April 14 Atlanta United 2, Philadelphia 2

April 20 Cincinnati 2, Atlanta United 1

April 27 Atlanta United 1, Chicago 1

May 4 Minnesota 2, Atlanta United 1

May 7 Atlanta United 3, Charlotte Independence 0 in U.S. Open Cup

May 11 D.C. United 3, Atlanta United 2

May 15 Cincinnati 1, Atlanta United 0

May 18 Atlanta United 1, Nashville 1

May 21 Atlanta United 0 (5), Charleston 0 (4) in U.S. Open Cup

May 25 LAFC 1, Atlanta United 0

May 29 Atlanta United 3, Miami 1

June 2 Charlotte 3, Atlanta United 2

June 15 Atlanta United 2, Houston 2

June 19 Atlanta United 1, D.C. United 0

June 22 Atlanta United 1, St. Louis 1

June 29 Atlanta United 2, Toronto 1

July 3 New England 2, Atlanta United 1

July 6 Real Salt Lake 5, Atlanta United 2

July 9 vs. Indy Eleven 2, Atlanta United 1

July 13 Montreal 1, Atlanta United 0

July 17 Atlanta United 2, NYCFC 2

July 20 Atlanta United 2, Columbus 1

July 26 D.C. United 3 (6), Atlanta United 3 (5) in Leagues Cup

Aug. 4 vs. Santos Laguna in Leagues Cup, 4 p.m.

Aug. 24 at L.A. Galaxy, 10:30 p.m.

Aug. 31 at Charlotte, 7:30 p.m.

Sept. 14 vs. Nashville, 7:30 p.m.

Sept. 18 vs. Miami, 7:30 p.m.

Sept. 21 at Red Bulls, 7:30 p.m.

Sept. 28 at Philadelphia, 7:30 p.m.

Oct. 2 vs. Montreal, 7:30 p.m.

Oct. 5 vs. Red Bulls, 7:30 p.m.

Oct. 19 at Orlando, 6 p.m.