Against velkoz, Force team fights as soon as possible: preferably when his Ultimate R is on cooldown. Do not delay a team fight as it will allow him to poke your team down with his Q and W. 

Avoid team fighting or forcing objectives like the Baron or Dragon when Vel’koz is alive and nearby. He has great poke thanks to his Q, W and R which will make it difficult for your team to secure the objective easily. 

Avoid fighting in chokepoints like inside the jungle as it will give Vel’koz an easier time landing his E, doing damage with his W and melting your team with his Ultimate R. Against velkoz, The Force team fights as quickly as possible: preferably when its Ultimate R is on cooldown. Do not delay a team fight as it will allow it to drop your team with its Qs and Ws. Avoid team fights or force goals like the Baron or Dragon when Vel-Skoz is alive and nearby. It has a great poke thanks to its Q, W and R that will make it difficult for your team to secure the goal easily. Avoid fighting in bottlenecks like in the jungle as it will give Vel-Skoz a easier time to land its E, doing damage with its W and founding your team with its Ultimate R.