Valverde made the Mets’ Opening Day roster last season, but after a combustive two months in their bullpen, the Mets released him in late May. He has struggled in each of the past two seasons, posting ERAs over five in both and giving up ten home runs in 40 total innings. Valverde’s last full season came in 2012, when he posted a 3.78 ERA with 6.3 K/9 and 3.5 BB/9 for the Tigers. The 36-year-old has 288 career saves with the Diamondbacks and Astros in addition to the Tigers and Mets.
The 29-year-old Elbert was a first-round pick of the Dodgers all the way back in 2004. He had two effective seasons of relief for them in 2011 and 2012, but had Tommy John surgery in 2013 and missed most of the next two years. The Dodgers outrighted him in early November, and he became a free agent.
The 30-year-old Mateo pitched for Triple-A Iowa in 2014, posting a 3.86 ERA, 10.4 K/9 and 4.1 BB/9 in 37 1/3 innings of relief. He last appeared in the big leagues with the Cubs in 2011.