The Seattle Sounders FC announced today midfielder David Estrada has been placed on injured reserve due to a right hamstring strain and right first toe sprain. As a result, Estrada is required to miss six games. He is eligible to return to league play for the September 4 game in New England against the Revolution. Estrada, 22, has appeared in three Major League Soccer games, with one start at FC Dallas. Seattle selected Estrada with the 11th overall pick in the 2010 MLS SuperDraft.