Walker Buehler got the best welcome-back-to-L.A. surprise at the airport Thursday ... he learned from our camera guy his Dodgers squad signed A.J. Pollock!!!
"We signed him today?! We signed him while I was on the plane?!"
The 24-year-old pitching phenom took the breaking news with a smile ... and said he was stoked to have yet another All-Star on the team.
"That's cool, man. He's a good player. That's cool, man. I'm excited!"
As for if Pollock is the missing piece the Dodgers need to finally get them a World Series ring .