MLB

Mets get phenom d’Arnaud as Dickey signs extension with Blue Jays

In Canada they can start calling him R. Eh? Dickey.

After weeks of failed contract negotiations with the Mets, R.A. Dickey officially became a member of the Blue Jays yesterday, agreeing to a two-year extension with Toronto that completed a seven-player trade with the Mets. The size of the trade and core players involved were first reported by The Post on Saturday.

The Mets received stud catching prospect Travis d’Arnaud, pitching prospect Noah Syndergaard, catcher John Buck and 18-year-old outfielder Wuilmer Becerra. In return, the Blue Jays received catchers Josh Thole and Mike Nickeas — in addition to Dickey.

“This was a complicated deal, but certainly we’re happy with the value,” Mets GM Sandy Alderson said.

The 38-year-old Dickey became the fourth reigning Cy Young award winner to be traded, joining David Cone, Pedro Martinez and Roger Clemens. The trade became official yesterday after Dickey passed a physical as a condition of the two-year contract extension worth $25 million he received from the Blue Jays. The extension also includes a club option for 2016 worth $12 million. Dickey is signed for $5 million in 2013.

“Thank you for making me feel wanted,” Dickey wrote to Mets fans on Twitter. “Looking forward to a new chapter with the Jays.”

Alderson said there were “several” contract extension offers the Mets made to Dickey that would have kept him with the club if he accepted. The Mets’ final offer was for two years and $20 million, according to sources, which Dickey rejected. If the Mets didn’t find an acceptable trade, Alderson said the team was prepared to bring Dickey into next season to play out his contract.

The 23-year-old d’Arnaud — rated by Baseball America as the game’s top catching prospect — was the key to the deal for the Mets.

Mets manager Terry Collins said he’s unsure if d’Arnaud, who played only 67 games at Triple-A Las Vegas last season before a torn posterior cruciate ligament in his left knee ended his season, will begin 2013 in the major leagues.

“The guys I have talked to — and that’s the scouts that have seen him — think he’s really close, but they are not sure he’s ready,” Collins said. “As I always try to do, I’ll make my own judgment in spring training.

“But you can’t come with the recommendations that this guy has had — our people and other people — and not be close.”

The 20-year-old Syndergaard was ranked No. 3 among Blue Jays prospects. The right-hander, who throws his fastball in the 95-mph range, went 8-5 with a 2.60 ERA last season with 122 strikeouts in 103 2/3 innings at Class A Lansing. He’s projected as a future top-of-the-rotation pitcher.

“We’re expecting that in two years he’s where [Zack] Wheeler is,” Collins said referring to the Mets’ top pitching prospect, who is expected to arrive in the majors by this summer.

The Blue Jays did not add money to the deal, meaning the trade is roughly a wash financially — the veteran Buck will make $6 million next season, which is roughly what Dickey and Thole combined would have earned.

With Dickey’s departure and Wheeler not expected to make the Opening Day roster, Alderson said it’s likely the Mets will explore the free-agent market for a veteran starting pitcher.

“We’re not going to replace [Dickey] with a No. 1 starter in return,” Alderson said. “But we’re going to have to find someone who can give us some of those wins.

“We have a starting pitching opening and can attract the type of pitcher that we hope can get us 10 or 12 wins.”

mpuma@nypost.com