McKee is out indefinitely with a fractured left ring finger. He sustained the injury in the third period of St. Louis's 6-3 loss Tuesday night to the Calgary Flames.
The Blues have recalled defenceman Jonas Junland from the AHL's Peoria Rivermen. Junland, 21, has 13 points (six goals, seven assists) in 21 games with the Rivermen.
Junland appeared in 52 games with Linkoping of the Swedish Elite League last season, registering 20 points (three goals, 17 assists). The native of Linkoping, Sweden, was a third-round pick (64th overall) by the Blues in the 2006 NHL Entry Draft.