Blues forward Vladimir Tarasenko is experiencing concussion symptoms stemming from Wednesday's hit by Colorado's Mark Olver.

“He’s got a pretty severe facial laceration, (and) some form of concussion," Blues coach Ken Hitchcock said. "We really don’t know yet … the severity of it."

The Blues have placed Tarasenko on the injured reserve list and called up forward Chris Porter from Peoria. Tarasenko will miss at least Saturday's game against Columbus, but with the seven-day IR designation being retroactive to Wednesday's game, he will be eligible for Thursday's game against Chicago.

But that point is moot for now because, as the Blues have learned with David Perron and Andy McDonald, concussion symptoms can be long term. Perron missed 97 games and McDonald missed 51 in recent years.

"(Tarasenko) has a headache today - he didn’t have one yesterday - but he does have a headache today and we’ll see in the next 48 hours how much better he gets," Hitchcock said. "He’s definitely not a player (Saturday) and then with all the time off, we’ll be able to read it."

Olver did not receive a penalty on the play and after extensive review by the NHL's Player Safety Department, the board did not believe the hit warranted any discipline.