FC Dallas midfielders Mauro Diaz and Hendry Thomas are expected to miss at least six weeks after Diaz had surgery on his ailing right knee and Thomas tore a leg muscle in a game at San Jose.
The team said Tuesday that Diaz had arthroscopic surgery to remove loose cartilage in his knee after missing three straight games. The 23-year-old Argentine is tied for second on the team with three goals in eight games.
Diaz could be out up to 10 weeks.
Thomas underwent a procedure to drain fluid from the torn muscle in his right leg, an injury sustained in a 2-1 loss to the Earthquakes on Saturday.
The 29-year-old Honduran could be out up to eight weeks. He is fourth on the team with 748 minutes.
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