On Monday, the Las Vegas Golden Knights agreed to trade Evgenii Dadonov to the Anaheim Ducks in exchange for Ryan Kesler and John Moore. The move would have helped the Golden Knights clear $5 million in cap space. They are set to get a Mark Stone and Alec Martinez back from long-term injured reserve and were trying to make room. On Wednesday, the NHL nullified the trade, citing something that Las Vegas was supposedly unaware of.

The NHL released a statement where they revealed their decision.

“The National Hockey League announced today that is has invalidated Monday's trade of player Evgenii Dadonov from Vegas to Anaheim. This trade could not be concluded because Dadonov's contract includes a limited no-trade clause, which has not been complied with.”

Dadonov has a 10-team no trade clause in his contract. But that contract was signed, Dadonov was a member of the Ottawa Senators. The Golden Knights claimed they were unaware of the clause in his contract.

Las Vegas acquired Dadonov via trade with Ottawa on July 28th for Nick Holden and a second-round pick. Ottawa normally would have included the paperwork including this clause. Dadonov obviously objected to going to Anaheim, and now will head back to Las Vegas. That will make for an awkward conversation.

Meanwhile, Las Vegas will still need to find a way to clear the cap space if they want to activate either Stone or Martinez. The Golden Knights can still trade the 33-year old winger, but he will not be eligible to play in the postseason.