I'm not following your logic. Are you saying that if a player is injured at point of sale, we should walk away? What happens when they recover a week or two later when they are fit again. For me, all players will get injured at one point or another, most are back at it sooner than later
The concern is obviously with serious injuries not minor knocks. Do all players make a full recovery from serious injury?
Injury history
Gundogan
Season injury from until Days Games missed
15/16 Dislocation of the patella May 2, 2016 Aug 8, 2016 98 days 3
15/16 Shin bone bruise Apr 21, 2016 Apr 25, 2016 4 days 1
15/16 Ankle problems Apr 21, 2016 Apr 25, 2016 4 days 1
15/16 Foot injury Apr 21, 2016 Apr 25, 2016 4 days 1
15/16 Bruised foot Mar 10, 2016 Apr 7, 2016 28 days 6
15/16 Influenza Feb 15, 2016 Feb 22, 2016 7 days ?
15/16 Infection Jan 25, 2016 Feb 1, 2016 7 days 1
15/16 Minor wound Dec 17, 2015 Dec 17, 2015 0 days -
15/16 Pelvis injury Dec 7, 2015 Dec 10, 2015 3 days 1
15/16 Rest Oct 1, 2015 Oct 1, 2015 0 days 1
15/16 Cold Aug 3, 2015 Aug 3, 2015 0 days -
14/15 Ill Apr 23, 2015 Apr 27, 2015 4 days 1
14/15 Hamstring Injury Jan 26, 2015 Feb 2, 2015 7 days 1
14/15 Adductor problems Oct 27, 2014 Oct 30, 2014 3 days 1
14/15 Training deficit Sep 2
Source Transfer markt