Reed becomes a veritable lock even with just 7 1/3 Major League innings under his belt during a September call-up last season.
"I don't believe 7 1/3 innings constitutes a lock," Cooper said. "But we love the 7 1/3 innings he did throw. He showed a lot of stuff that we like. No fear. Threw strikes. Good stuff. I also know the things from seeing him in the big leagues that we need to get more consistent.
"What I'm talking about to Addison Reed is to come ready physically and mentally and do what you gotta do in Spring Training and make the team. If he comes and does what we're expecting him to do, I expect him to get on the plane."
Three bullpen spots remain open, with one of those long relief openings going to Zach Stewart, Dylan Axelrod or possibly Hector Santiago. Cooper said that Stewart will work two or three innings at a time during Spring Training and will even get some split-squad starts.