Patriots fear DE Derek Rivers lost for season with knee injury

FOXBOROUGH, Mass. — The New England Patriots fear they have lost rookie defensive end Derek Rivers for the entire season due to a knee injury, league sources told ESPN on Friday. Rivers, a third-round draft choice from Youngstown State, went down on a kickoff coverage drill in Wednesday's joint practice with the Houston Texans. It was a non-contact injury which had head athletic trainer, Jim Whalen, examining Rivers' left knee on the field. With that practice taking place at The Greenbrier in White Sulphur Springs, West Virginia before the Patriots traveled to Houston for Saturday's preseason game, the club had Rivers fly back to Boston for more tests. Those tests reinforced the team's initial