#3 Playing out of position
Although Antoine Griezmann's versatility and dynamism allow him to be deployed across any position in the offensive zones, his natural role, nevertheless, is to play behind the centre forward, whether as a secondary striker or an attacking midfielder.
That enables him to produce his best performances on the pitch just as we witnessed during his time with Atletico Madrid as well as his World Cup outing with France in Russia last year. Unfortunately for the Frenchman, there's no such role at Barcelona currently.
Griezmann has been forced to play mostly on the left flank since he joined the Blaugrana this season. His output from that side of the pitch is very low. While he performed slightly better as a center forward during Luis Suarez's injury lay-off, the return of the Uruguayan means that he would continue to feature on the flanks. Playing out of position would surely limit the impact of the ex-Atletico Madrid sharpshooter.