As per Sportsnet's Elliotte Friedman, it emerged that Torey Krug, with his no-trade clause, put a halt to the trade. He quoted:
We will see how this develops throughout the next day or so, but hearing this morning that Torey Krug is leaning towards not waiving his no-trade clause.
The Resistance to Relocate
Torey Krug, an experienced defenseman, has been a part of the Blues team since the 2019-2020 season. He presently has a cap hit of $6.5 million and four more years to currently serve.
This situation takes an intriguing turn as both teams are eager to finalize this trade. However, they find themselves in a stalemate until they either persuade Krug to give up his no-trade clause or devise a new agreement.
That's the problem teams encounter run when inserting no-trade clauses into players' contracts - they can often rebound on the team, causing substantial setbacks.