SAN FRANCISCO -- Catcher Wilin Rosario, whose passed ball Monday night allowed a run to score in the Rockies' 2-1 loss to the Giants, is expected to do some kind of catching work at the organization's request after the regular season ends, manager Jim Tracy said Tuesday. Rosario, 23, who leads National League rookies with 24 home runs but also leads Major League catchers with 20 passed balls, could participate in instructional ball or winter ball in the Dominican Republic with an eye toward improving fundamentals. Tracy said it isn't clear what prescription the organization will offer, but there will be one. "We're talking about a number of different things," Tracy said. "I really don't want to get into the details of it today, but putting a program in place for him to get started on sooner than later is something that we are gearing ourselves toward.
"Moving forward, these things have to improve measurably between now and the start of next season. Those type of things matter, as we have seen." Rosario committed five passed balls in two one-run losses in Philadelphia earlier this month. In the current four-game series with the Giants, Rosario will not catch Thursday, when left-handed veteran Jorge De La Rosa makes his season debut. De La Rosa, completing a comeback from Tommy John elbow surgery, will pitch to Jordan Pacheco, Tracy said.