And ahead of Monday 's trip to West Brom they went head - to - head to see who could conquer the crossbar challenge .
Mata and Herrera know each other well from their time together with Spain 's youth teams .
Ahead of Monday 's trip to West Brom each other went head - to - head to see who could conquer the crossbar challenge .
Mata and Herrera know each other well from their time together with Spain 's youth teams .