He was poor by poor standards. But if he joins I will give him a chance.
Alderweireld was never poor for Atletico, they just have better defenders.
It is so hard to judge how good some players are if they are playing for good sides I think, to stand out for these teams you have to be exceptional. The fact that Suarez was playing pretty regularly at a team like Atletico shows that he is a good player who would most likely be better than the majority of other current options..
