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The injury that knocked Bears running back Matt Forte out of Thursday night’s loss to the Packers is likely to knock him out of more games as well.

Although a more thorough diagnosis is likely to come today, the Bears believe Forte suffered a high ankle sprain, ESPN’s Adam Schefter reports.

A high ankle sprain is usually an injury that costs a running back multiple games, so Forte could be out for a while. Bears backup running back Michael Bush said after the loss to the Packers that he’s ready to carry the load as long as Forte is out.

“That’s why I’m here: They brought me here to pick up where [Forte] left off, if something went wrong,” Bush told the Chicago Tribune. “It’s the insurance plan, I guess. I’ll be ready.”

The Bears will need Bush to be ready. Their offense looked terrible on Thursday night even before Forte went down.