Milwaukee Bucks GM Jon Horst agrees to long-term extension

After architecting the franchise's first NBA championship in 50 years, Milwaukee Bucks general manager Jon Horst has agreed to a long-term contract extension, he told ESPN on Friday.

Horst had one year left on his contract, and his new deal -- finalized Friday morning with his agent, Brian Elfus, and team officials -- takes Horst through the next several years, sources told ESPN.

A formal announcement will come later Friday.

Horst's deal punctuates the signing of several key organizational members in the past year, including NBA and Finals MVP Giannis Antetokounmpo, guard Jrue Holiday and coach Mike Budenholzer. Horst is starting his fifth season as general manager, a run flush with two No. 1…