Barcelona host United at Camp Nou with an away goal advantage, having beaten the English side 1-0 at Old Trafford last week, but they will still be aware that the visitors are capable of turning it around in the second leg, similar to how they did against Paris Saint-Germain.
De Gea, however, believes that the team will have to do a lot better to have any chance, especially considering they needed two penalties to get their win against West Ham United on Saturday.
Champions League: De Gea warns Manchester United ahead of Barcelona game https://t.co/UlVwb9K8D2— HiveMediaNG (@HiveMediaNG) April 15, 2019
"Of course it's difficult, but if you want to be a top team you have to play big Champions League games, and the weekend after it's the Premier League," De Gea said, according to Goal.
"We will try to fight and win the game. We can go with more confidence after the three points.