Four days before the regular season finale in Washington that will likely determine their playoff fate, the Giants today placed three key players on injured reserve. Defensive end Michael Strahan, tackle Luke Petitgout and punt and kickoff returner Chad Morton were all put on I.R. and are officially out for the remainder of the season. To take their places on the roster, the Giants signed wide receiver Darius Watts, tight end Darcy Johnson from their practice squad, and running back Robert Douglas from the Houston Texans? practice squad. Strahan suffered a Lis Franc sprain in his foot on Nov. 5 against Houston. He sat out the next six games, then returned to the field in Sunday?s 30-7 loss to the New Orleans Saints. Strahan had five tackles (three solo) and knocked down a pass. But he aggravated the injury late in the game and may need surgery.