Report: Birmingham City finalizing Kai Wagner transfer

Kai Wagner transfer rumors online have become a holiday tradition for Philadelphia Union fans but news first reported by Jose Nunez on New Year’s Eve that Birmingham City is finalizing a deal to acquire the star left back is far from a rumor this time.

Birmingham City is fighting for relevancy in the Championship and while Birmingham, England isn’t exactly a dream destination, Wagner has long expressed a desire to be playing at a higher level back over the pond (while making closer to the dollar figure he has shown he deserves).

Promotion to the Premier League may not be likely this season for a team that just dropped to 16th place a January transfer could put the 28-year-old German in a great spot to acclimate to the Championship ahead of the 2026-2027 campaign.

The sale of the Union’s best player would be another windfall (one report states Birmingham is forking out around $3 million for a release clause) for a team that is already approaching a 2026 season with far less institutional knowledge and experience on the field. The back line has already lost its veteran leader with Jakob Glesnes sold off to LA Galaxy and leading goal scorer Tai Baribo sent to D.C. United in a $4 million deal the Union really couldn’t refuse.

Wagner, who was both a defensive force and offensive leader, will be nearly impossible to replace. While Nathan Harriel and Frankie Westfield have played left back, there isn’t a natural left back on the first team roster. Union II left back Jordan Griffin has a ton of promise but is only 17. Westfield did well in his one season there with Union II but he also excelled in his rookie season at right back so you might not want to try to “fix” that. Look for at least one more incoming transfer at left back if this deal goes through.

While the “good business” moniker Union fans have grown accustomed to using when explaining offseason moves of beloved players will again apply, a move of this nature has the real potential to lower the bar on what the Union will be able to achieve in 2026. They’re already out Quinn Sullivan for part of the season as he recovers from an ACL injury and there are going to be a number of players to acclimate to the team while also playing in Champions Cup.

Head coach Bradley Carnell – his firing as underserved in St. Louis as Jim Curtin’s in Philadelphia – was a breath of fresh air in his first season but he had a stacked roster and no Champions Cup or Leagues Cup to slow down their run to a Supporters’ Shield. His tendency to roll the dice and dare teams to score on them and his currently on leave boss’s seeming refusal to acknowledge the MLS Cup as a bigger prize than Supporters’ Shields and personal accolades for transfer deals may all be too much to overcome in 2026.