Preston v Brentford - Head Injury from restart

#1
Preston have just scored a goal.
Brentford re-start the game.
Preston attacker runs into Brentford player.

To me, it seems the player drops his shoulder and hits the player. The attacker could quite easily have avoided the Brentford player but chose not to.
The player reportedly goes down concussed.

What are your thoughts on this, and, if any, what punishment would you have given?