SCOTTSDALE, Ariz. - The Colorado Rockies first full-squad workout was missing a key arm. Jhoulys Chacin, the teams top right-handed starter a year ago, was shut down Sunday because of inflammation in his throwing shoulder. Hes scheduled to undergo an MRI on Monday. "I feel good about the fact that we caught it early," Rockies manager Walt Weiss said. "Hes had it at times in the past. Not necessarily last year, but I think the year before. So were being really cautious with it. Its the first day of camp, so weve got time on our side. "Well hope for the best, but Im not overly concerned right now, just because its February," he said. Chacin had been limited with his throwing in the first few days of camp. "It sounds like its something he tried to pitch through in the past and it kind of lingered and lingered," Weiss said. "So were trying to get ahead of it." Chacin was Colorados most reliable pitcher in 2013, logging a team-high 197 1-3 innings. The 26-year-old went 14-10 with a 3.47 ERA and allowed only 11 home runs despite playing home games in hitter-friendly Coors Field. But the Venezuela native had arm problems in 2012, when he was limited to 14 starts. On a staff without a true ace, Chacin and left-hander Jorge De La Rosa top Colorados rotation. Weiss indicated it was too early to rule out Chacin as a possible opening-day starter. "Well know in the next few days or a week when we have a better idea how serious it is," Weiss said. Chacin and right-hander Wilton Lopez (stiff neck) were the only players to sit out as the Rockies held their first workout Sunday with all position players present. Weiss, beginning his second season and armed with a new three-year contract, addressed the team Sunday morning and said he focused on creating a winning identity. The Rockies went 74-88 last season, a 10-game improvement from Jim Tracys final season as manager in 2012. Colorado last made the playoffs in 2009. "Effort, Im not too concerned with in this group," Weiss said. "These guys are going to show up every day. But on top of the effort youve got to play the game right. Its the execution I was talking about." One player happy Sunday was Carlos Gonzalez. After Weiss initially told the three-time Gold Glove left fielder hed move to centre, Weiss changed his mind. Gonzalez is back in left, with newly-acquired Drew Stubbs leading a group competing for the starting job in centre vacated when Dexter Fowler was traded to Houston. "It was the first time in a while I didnt know where I was going to play," Gonzalez said. "Its always in your mind. Im happy to be back in left field. Thats where Ive been playing for the past three years. "They knew that playing centre field was going to take a lot from me," he added. 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