The Chicago Bears elevated defensive tackle Christian Tupou to the active roster from the practice squad and placed defensive tackle Nate Collins on injured reserve due to a knee injury.
The 6-2, 290-pound Tupou spent the entire preseason with the Bears, appearing in all four preseason games, recording four tackles and one sack. He is in his rookie season out of USC after going undrafted and unsigned in 2012. He appeared in 41 games with 32 starts over five seasons (2007-11) for the Trojans, recording 53 tackles and seven tackles for losses.
Collins appeared in five contests with two starts for the Bears this season, recording 12 tackles, one sack and one tackle for loss.
Tupou will wear number 64.
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