Lucknow Super Giants are up against Kolkata Knight Riders in a crucial IPL 2024 match at the BRSABV Ekana Stadium in Lucknow Today (Sunday, May 5).
In the match, Yudhvir Singh has come on as a concussion substitute for Mohsin Khan during the KKR batting.

Lucknow Super Giants pacer Mohsin Khan injured his head while attempting a catch. Mohsin dived to his right but his head struck first on the ground, and the player was visibly injured. The concussion test happened and after some time, and it was reported that Mohsin would not take any part in the match anymore.
Hence as a concussion substitute, Yudhvir Singh came on for LSG to bowl and picked up the wicket of Angkrish Raghuvanshi in his first ball.
Yudhvir Singh is not an Impact Player and he is just a concussion substitute. It is allowed if a player is taken off due to a concussion or any head related injuries.
Yes, LSG can bring on a player as an Impact Player during their batting. In case of a concussion substitute, the substitute quota of one player is not considered.