(CBS) Jonathan Toews’ “upper body injury” is a concussion, a source told 670 The Score’s Blackhawks expert Jay Zawaski.

The severity of the concussion is not known, but it is believed Toews suffered the injury early in the Blackhawks’ recent road trip. A second source said it happened Feb. 10 at San Jose. The source also said that Toews may have hidden his symptoms from the team to remain on the ice.

Toews missed Tuesday night’s 2-1 win over the Red Wings and did not practice Wednesday. He will not play when the Blackhawks host the Dallas Stars Thursday, but he is listed as day-to-day.

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