Not only has he been playing center for them but he is starting as well.

The box scores for the last 6 games.

He is listed as a FC on Portland's NBA.con site.

Part of a story from the Oregonian

In Aldridge's fourth game, McMillan moved him into the starting lineup at center in place of veteran Jamaal Magloire.

Aldridge's rise allowed McMillan to move Magloire to the second unit, producing a better balance because Zach Randolph and Magloire are similar, post-oriented players.

"It allows us to run our sets. We have a post player in our first unit, we have a post player in our second unit, and we can go to them," McMillan said.