The uefa Champions League Balls for PES2017 by Milad Behzadi adds the UCL ball in game.
How To Install UEFA Champions League Balls In Pro Evolution Soccer 2017: [download]
1. Extract the archive (3.8MB) with winrar and copy UEFA Balls.cpk to 2017\download\;
2. Open and select DP in DpFileList Generator;
3. Add Uefa Champions League Balls.cpk as last checked, generate DpFileList and play!