4:00 PM PT -- The Blackhawks say Khaira suffered a "significant" injury as a result of the hit ... though they added he was released from the hospital Wednesday morning and "his prognosis is excellent."
The team also said he's expected to make a full recovery -- but it still remains unclear when he'll be able to return to the ice.
Scary moment in the NHL on Tuesday ... Chicago Blackhawks winger Jujhar Khaira was knocked out after taking a violent shoulder to the face -- and he was eventually hospitalized.
The horrifying scene all went down in the second period of the Hawks' game against the Rangers in Chicago ... when Khaira was blindsided by New York star Jacob Trouba.
Really scary scene in Chicago as Jujhar Khaira is knocked out cold by Jacob Trouba. Paramedics on the ice. pic.twitter.com/so2YmuXl8Q