The Mets transferred Tatis from the 15-day to the 60-day disabled list to make room for outfielder Carlos Beltran on their 40-man roster.
Tatis, 35, was hitting .185 with two home runs in 65 at-bats as the team's primary right-handed pinch-hitter and backup first baseman. A strong candidate for the 2008 National League Comeback Player of the Year award, Tatis originally separated his shoulder in September of that season. Opting for rehab over surgery at the time, Tatis has played in varying degrees of discomfort ever since.
Last month, the Mets finally placed him on the disabled list with a right shoulder AC joint sprain. Tatis is unlikely to return this season and, at 35 years old, may face an uphill climb to return at all.