The Mets announced Monday that they signed the right-hander Aaron Harang to a minor league contract and assigned him to Class AAA Las Vegas. Harang has pitched for five teams over 12 big league seasons, going 110-115 with a 4.29 ERA. Harang, 35, went 5-11 with a 5.76 ERA in 22 starts for the Mariners this season, striking out 87 and walking 28 over 120 1/3 innings. Manager Terry Collins said the Mets needed a starter to work Sept. The Mets, meanwhile, are using Daisuke Matsuzaka and Carlos Torres as their fourth and fifth starters, but Matsuzaka struggled in his first two outings and Torres is capable of working out of the bullpen. Not only are right-handers Rafael Montero and Jacob deGrom both approaching innings limits, but deGrom left his last start after two innings with right shoulder stiffness.