McCann was the Tigers' top selection in the 2011 First-Year Player Draft. He's hitting .306 with two home runs and 32 RBIs, and is ranked as the top catcher and the team's No. 11 prospect in the Tigers' farm system by MLB.com.
The Tigers signed Perez as a non-drafted free agent in 2007, and he's ranked as the team's No. 12 prospect. He has an Eastern League-high 24 doubles this season and is second in the league with 93 hits and 19 stolen bases. Perez played in two games with the Tigers last summer.
Saupold will not participate in the All-Star Game after being placed on the seven-day disabled list with a shoulder injury. Before he was sidelined, he went 4-3 with a 2.96 ERA in 13 starts.
The Tigers signed Startup this offseason after he was released by the Orioles. He's made 16 appearances out of Erie's bullpen, holding opposing hitters to a .195 batting average with a 2.10 ERA.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. Bobby Nightengale is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.