Gsellman, out since his June 27 start with a strained left hamstring, is not yet ready to start a throwing program, Newsday reports. "He's again doing the rehab stuff and making sure his leg's OK," manager Terry Collins said. "But we can't do too much throwing-wise until we know his legs are going to be able to handle it."
Gsellman was injured running to first base during that June outing. He is likely at least a week away from beginning a throwing program; even if all goes well, it probably puts him almost a month away from rejoining the Mets.