Manchester United's Chilean forward Alexis Sanchez (L) vies with Sevilla's Colombian forward Luis Muriel during the UEFA Champions League round of 16 first leg football match Sevilla FC against Manchester United at the Ramon Sanchez Pizjuan stadium in Sevilla on February 21, 2018. Pic/AFP

Former Manchester United stopper Nemanja Vidic is of the opinion that club's latest acquisition Alexis Sanchez will play a vital role in club's Champions League campaign.