Inter Milan's Lautaro Martinez celebrates a win after the end of a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan players are seen after the end of a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Matteo Darmian kicks the ball during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Lautaro Martinez celebrates after scoring his third goal against Monaco during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Marcus Thuram, left, and Monaco's Mohammed Salisu vie for the ball during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Monaco's Aleksandr Golovin, right, and Inter Milan's Denzel Dumfries fight for the ball during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Lautaro Martinez celebrates after scoring during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Monaco's head coach Adi Huetter reacts during a Champions League soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Lautaro Martinez celebrates after scoring the opening goal during a Champions League opening phase soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.

Inter Milan's Lautaro Martinez scores from penalty during a Champions League soccer match between Inter Milan and Monaco, at the San Siro stadium in Milan, Italy.