Barcelona's Lionel Messi celebrates scoring their second goal as Manchester United's David de Gea reacts during the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Messi produced another masterful Champions League performance to knock out Manchester United and fire Barcelona into the semi-finals for the first time in four years, scoring twice in a 3-0 home win on Tuesday. REUTERS/Sergio Perez

Barcelona's Lionel Messi celebrates scoring their first goal with Philippe Coutinho during the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Barca, who toyed with United for the majority of the encounter, sealed a 4-0 aggregate victory and will meet either Porto or Liverpool in the last four. Reuters/Carl Recine

Barcelona's Lionel Messi scores their second goal during the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Messi produced another masterful Champions League performance to knock out Manchester United and fire Barcelona into the semi-finals for the first time in four years, scoring twice in a 3-0 home win on Tuesday. REUTERS/Sergio Perez

Barcelona's Lionel Messi shoots at goal during the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Barca, who toyed with United for the majority of the encounter, sealed a 4-0 aggregate victory and will meet either Porto or Liverpool in the last four. REUTERS/Susana Vera

Manchester United's David de Gea reacts after Barcelona's Lionel Messi scored their third goalduring the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Messi produced another masterful Champions League performance to knock out Manchester United and fire Barcelona into the semi-finals for the first time in four years, scoring twice in a 3-0 home win on Tuesday. REUTERS/Susana Vera

Manchester United manager Ole Gunnar Solskjaer with Barcelona's Lionel Messi after the Champions League Quarter Final Second Leg match between FC Barcelona and Manchester United at Camp Nou, Barcelona, Spain, April 16, 2019. Barca, who toyed with United for the majority of the encounter, sealed a 4-0 aggregate victory and will meet either Porto or Liverpool in the last four. Reuters/Carl Recine