Tribe general manager Chris Antonetti indicated that Naquin -- rated by MLB.com as Cleveland's fifth-best prospect -- was being re-evaluated on Thursday and there was no established timetable for his return to game action. Given the nature of the injury, the Indians do not want to risk allowing the young center fielder to return before he is back at full strength.
"[We're] trying to get our arms around how he's doing," Antonetti said on Thursday. "He did collide into the wall and we were obviously very careful with it and wanted to make sure we were prudent. We removed him from the game, because obviously any time you have a head or neck involvement, you're fearful of a concussion. The good news is Tyler is up, he's mobile, but it may be a little while before he's back into game activity."
The 24-year-old Naquin was playing center field on Wednesday when he slammed his back into the wall on a catch attempt in the second inning against Indy. Naquin immediately fell to the ground, where he stayed until shifting to his feet during a chat with a team trainer. The outfielder left the game and was placed on the seven-day DL on Thursday.
Naquin, who was taken with the 15th overall pick in the first round of the 2012 Draft, has hit .297/.379/.436 with six homers, 29 extra-base hits, 25 RBIs, 36 walks, 13 stolen bases and 45 runs in 77 games this season between Double-A and Triple-A. He has a .751 OPS in 43 Triple-A games and an .887 OPS in 34 Double-A games this year.
In four professional seasons, Naquin has hit .286 with a .773 OPS in 315 games in Cleveland's system.
"He's on a really good path developmentally," Antonetti said. "He did a very good job in Double-A on his developmental goals and has continued to make progress in Triple-A. He's been challenged at the Triple-A level by facing better pitching than he's faced to this point in his career. He's doing a really good job acclimating himself offensively and continuing to learn the speed of the game defensively. He's in a good spot."
Jordan Bastian is a reporter for MLB.com. Read his blog, Major League Bastian, follow him on Twitter @MLBastian and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.