After missing 10 straight games because of a low knee injury, receiver Marvin Harrison is expected to play in an AFC divisional playoff game against the San Diego Chargers. "With Marvin we can do a lot more things because he understands things better," running back Joseph Addai said Thursday. "With the young guys we had to simplify some things, which is good, but the defense will have to respect him because of what he's done in the past." The Indianapolis Colts had to learn to live without Harrison for most of this season. Now, they will need to readjust in getting him back on the field. This could prove to be dangerous for the Colts. It is important for the Colts that Harrison not be rusty for tomorrow's game. After missing ten games, however, one could expect Harrison to not be as potent a player as he used to be. This possible situation could be deadly for the Colts' offense against a San Diego defense that has forced a league-high 48 turnovers and ranks as one of the best in the league. The Colts had better not rely to heavily on Harrison until it is established that his lack of playtime this season has not hindered his skill and ability as a top-notch receiver.