Collins said he wouldn't talk to general manager Sandy Alderson until Monday, when the Mets return home after the Nationals series. But with Santana offering no denial of the notion, his possible shutdown will loom a little longer.
"Well, I don't know if he's asking for it," Collins said. "What he is basically saying is if that's what we think we should do to make sure he's healthy next year, he's on board with it. He understands the whole thought process behind it."
Santana's next start is slated to come Thursday against the Rockies, and the Mets could decide to wait on another outing to see how he throws. With his velocity remaining steady and his command fine for three innings on Friday, Santana's fourth-inning collapse was all the more stunning.
"That's the question we're trying to discover, we don't have an answer to it," Collins said. "When you're trying to get a ball away to Bryce Harper and you leave it down and in, the one spot that he can do damage. Is it mechanical? Is it the release point?
"As far as I'm concerned, it's a baseball issue. Obviously, we will ask for the input of our training staff."
Santana has allowed at least six runs in five consecutive starts, the first pitcher in Mets history to do so. In the process, he has fallen to 6-9 on the year and escalated his ERA to 4.85 while working toward a return to form as the Mets' ace following offseason surgery to repair a torn capsule in his throwing shoulder.
But since his no-hitter on June 1 -- another franchise first -- Santana has collected a loss in seven of his 10 starts, compiling an 8.27 ERA in 49 innings on the mound.
"You know, my season has been a roller coaster, a lot of ups and downs, good days and bad days," Santana said after Friday's start. "But I'm very positive about everything. I'm coming back from a major surgery. ... It means a lot to me, so I look at it in a positive way that this will be a positive sign looking toward the future."