Buck suffered a laceration on his right thumb and was placed on the 15-day disabled list following the game. X-rays on Buck's hand came back negative for any structural damage, but he did require three stitches.
Toronto promoted top catching prospect J.P. Arencibia to replace Buck's spot on the roster.
"I think I'm pretty fortunate that nothing broke," Buck said. "The ball hit off the front of my finger and basically tore the flesh back about an inch or two. I can move it. Everything feels fine -- it's just a matter of the flesh healing."
With no outs and runners on first and third base in the fifth, Rodriguez fouled off a 3-1 pitch from Blue Jays starter Shaun Marcum. The ball struck Buck's hand, which is typically exposed with runners on base, and the catcher immediately began walking around the field in obvious pain.
After being checked out by Blue Jays manager Cito Gaston and head trainer George Poulis, Buck left the field and headed to the clubhouse. Backup catcher Jose Molina replaced Buck behind the plate.
In 84 games with the Blue Jays this season, Buck has hit .277 with 14 home runs and 49 RBIs. He was named to the first All-Star team of his career last month.
Buck hoped to avoid the disabled list, but he knows the Jays can't afford to play with just one catcher, even if it is for only a few days. Buck said that he could grip a bat with no problem, but he would need a few days to see if the injury hinders his ability to throw.
"I told Cito I felt fine," Buck said. "I think he looked at the stitches and laughed at me. I think to go three or four days just to see if your catcher can throw -- 'Is he going to be ready?' -- that's obviously pushing the envelope."
Arencibia was a first-round pick by the Blue Jays in the 2007 First-Year Player Draft. Through 95 games with Triple-A Las Vegas, Arencibia has hit .303 with 31 home runs, 32 doubles, 71 runs scored and 79 RBIs.
Jordan Bastian is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.