This was actually from 2 seasons ago but just thought i would post up a picture.

It was at the end of the season and i was playing a friendly match and got a player injured on the 9th minute so i subbed him and the player that came on got injured 1 min later.

They were both injured for around 8 days and i lost the league and champions league final that year

Click image for larger version.  Name: 2013-06-28_20-09-18.jpg  Views: 11  Size: 65.9 KB  ID: 10529