Your worst injury to your star player

Had a regen get a virus and was out for 13 months.
The best defender was my regen, got injured for 8 months, comes back, his ratings from 7.9ish - 8ish, down to 7.5. And always get injured, sold him a year later to RM for 46m euros
Ronaldo broken leg in 2015. Went from 1# in the world and over 1 goal per game ratio to being a sub and then sold to Arsenal for 15m€ where he scored 4 goals in his first season. Save file got corrupted later. lol