FOXBOROUGH, Mass. (AP) – The NFL reviewed the block that injured Patriots safety Rodney Harrison and found it to be legal.

Mike Pereira, the league’s director of officiating, said Tennessee Titans receiver Bobby Wade did not commit an illegal crackback block because he was blocking upfield and not back towards the ball, NFL spokesman Greg Aiello said Tuesday.

Harrison injured the medial collateral ligament in his right knee, according to The Boston Globe and the Boston Herald; it was not clear how long he will be out. Harrison’s agent, Steve Feldman, did not return a call seeking comment, and Patriots spokesman Stacey James declined comment in advance of Wednesday’s official injury report.

Harrison, 34, was injured in the second quarter of Sunday’s 40-23 victory over the Titans. Wade lined up to the right of the line of scrimmage, when Travis Henry carried for a 9-yard run. Harrison was chasing the play when Wade hit him with a low block.

Patriots players were angry over the hit, but no penalty was called and Harrison was able to walk off the field.

Harrison tore three ligaments in his left knee at Pittsburgh in the third game last year and missed the rest of the season. He started the first eight games this season, then broke his right shoulder blade in a 27-20 loss to Indianapolis when wide receiver Marvin Harrison fell on his arm.

AP-ES-01-02-07 1736EST