NEW YORK -- The A's are working toward finalizing a trade with the Mets that would further strengthen their sturdy bullpen.
Sources indicated to MLB.com on Friday evening that right-hander Jeurys Familia could soon be Oakland-bound. Combined with All-Star closer Blake Treinen and rookie phenom Lou Trivino, they would form a three-headed relief monster for a club making a surprising playoff push. The A's are expected to part with multiple prospects.
Neither team confirmed the deal, which could be finalized as soon as Saturday.
"The most important thing for me is, I had a really good time here," Familia said before leaving the clubhouse on Friday. "It's tough, man. Just waiting right now on what's going to happen."
About midway through the Mets' 7-5 win over the Yankees, manager Mickey Callaway received word from the front office that a trade was brewing. Callaway was instructed not to use Familia, who sat in a hooded sweatshirt on the bullpen bench as Robert Gsellman closed out the victory.
Entering the day three games back of the Mariners for the second American League Wild Card spot, the A's have flourished thanks in large part to their bullpen. They are 38-0 when leading after seven innings this season, and 46-0 when leading after eight, relying on Treinen and Trivino.
Familia, who ranks third in Mets history with 123 saves, would add an accomplished closer's resume to that mix. Over seven seasons, he owns a 2.66 ERA with more than a strikeout per inning, including 43 whiffs in 40 2/3 innings this year.
Much as the A's envision a three-headed monster at the back of their bullpen, the Mets believed Familia, AJ Ramos, Anthony Swarzak and Jerry Blevins would form the core of a standout bullpen for them this season. Only Familia has remained mostly healthy and consistent.
He has also saved some of his best pitching for July, throwing seven shutout innings this month.

"He's done a great job for the organization," Callaway said. "Such a great guy with everybody in the clubhouse, the staff. He'll be missed if he ends up going."
Even before the Padres traded Brad Hand to the Indians this week, Familia was arguably the top bullpen option available for contenders such as the A's -- though his resume is not without its flaws. During the 2015 World Series, Familia blew three saves. Familia also served a 15-game suspension in 2017 for violating Major League Baseball's joint domestic violence policy, then missed time later that year recovering from arterial surgery on his right shoulder.
But he has rebounded from injury issues to thrive in 2018, morphing back into an attractive trade chip. A Mets club that entered the season with postseason aspirations is now taking calls on players ranging from Familia to Asdrubal Cabrera, Wilmer Flores and Zack Wheeler, with even Jacob deGrom and Noah Syndergaard more remote possibilities to be traded.
Although Familia is making $7.925 million this season, Mets assistant general manager John Ricco said Friday that the Mets are willing to eat salary in an effort to acquire the best prospects possible in any deals. There was no immediate word how salary issues would work between the Mets and A's.
"We're looking to maximize value coming back," Ricco said. "We have the ability to carry some of the money in order to increase the return."
As Familia slung a bag over his shoulder and prepared to leave the Mets' clubhouse late Friday night, a group of teammates approached his locker. They hugged Familia and slapped him on the back, wishing him luck.