Huddersfield forward Anthony Mullally has been told he will not face any action over the tackle that left St Helens winger Ade Gardner unconscious during Monday night's Super League match at the John Smith's Stadium.
The former Widnes prop was penalised and put on report by referee Richard Silverwood following the challenge that knocked out the ball-carrying Gardner two minutes before half-time.
The game was held up for eight minutes while medical staff administered oxygen to the former England winger before he was eventually carried from the field on a stretcher with his head in a neck brace.
Huddersfield coach Paul Anderson, a former team-mate of Gardner, insisted in the post-match press conference that the former England winger had fallen into Mullally's tackle after losing his footing on the newly-laid turf and the Rugby Football League's match-review panel supported his view.
A statement issued by the RFL said that Mullally had made contact with Gardner's head, adding: "However, the player makes a legitimate attempt to tackle by wrapping his arms around his opponent who falls significantly into contact."
Gardner, 29, recovered quickly in the dressing room at half-time and was able to travel back to St Helens on the team coach.
A St Helens spokesman said the player "will be monitored" this week and will need to pass the regulation "head test" before being considered for Sunday's home game against Bradford.
Huddersfield won the match 25-16, completing their first league double over St Helens since 1951.