By Adam Hoge

PITTSBURGH (CBS) – Bears defensive tackle Henry Melton was carted off the field early in the fourth quarter of Sunday night’s 40-23 win against the Steelers.

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The Bears announced Melton suffered a knee injury and would not return to the game. After the game, head coach Marc Trestman did not have further details, only saying that the defensive tackle was “under observation”.

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It’s been a rough 2013 season for the Pro-Bowler, who was given the franchise tag over the offseason instead of a long-term deal. Melton missed most of the preseason with a concussion and was not very effective in the first three games before getting injured Sunday night.

Melton will undergo testing on his left knee and the severity could be known as early as Monday.

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Adam Hoge covers the Bears for CBSChicago.com and is a frequent contributor to 670 The Score. Follow him on Twitter at @AdamHoge.