Paul Pogba, who has been linked with a move to Juventus and Real Madrid, starred in Manchester United's dominant first-half.
David De Gea is in the last year of his contract and has been linked with French champions Paris Saint-Germain.
David de Gea is so far holding out in contract negotiations to prolong his current deal beyond the summer of 2020.
Jose Mourinho said he wanted David de Gea to stay, and he remains optimistic an agreement on the player's will be reached.
Spain face a tough challenge to reach the FIFA World Cup 2018 knockout as the 2010 champions take on eliminated Morocco in their Group B clash at Kaliningrad Stadium on Monday.
Spain would be desperately seeking three points in their World Cup Group B match with Iran after being held by Portugal.
Iran are sitting on top of the World Cup Group B team standings and Spain would like to change that.
De Gea had previously denied any involvement in the sex assault case
David de Gea deflected the attention away from Paul Pogba with another spectacular display of goalkeeping as Manchester United came away from their Champions League last 16, first leg against Sevilla in Spain with a 0-0 draw on Wednesday.
The Spain goalkeeper, who almost joined Real Madrid in 2015 and continues to be linked with a move there, has a contract that expires in June 2019.
Spain were frustrated throughout by the Czechs' stubborn defensive game, which finally fell apart when Gerard Pique got his head to Andres Iniesta's cross towards the back post where he beat goalkeeper Petr Cech in the 87th minute
David De Gea has strongly denied allegations that he organised a party at which two women were forced to have sex with two footballers
Spain will be aiming for a hat-trick of Euro crowns but their campaign has been marred by allegations that goalkeeper David de Gea was involved in a sex scandal.
David De Gea allegedly organised a party at which women were forced to have sex with two footballers
David de Gea's name appeared in the testimony of a "protected witness" as part of an investigation in to a sex scandal, along with his former teammate Iker Muniain
Goals from Wayne Rooney, 18-year-old Marcus Rashford and substitute Ashley Young secured the three points, which was enough to lift Manchester United above Southampton into fifth place in the Premier League
Manchester United seek desperate turnaround as they aim to win against FC Midtjylland in a crucial Europa League match.
Manchester United F.C. slipped further in the Premier League after losing 1-2 to Sunderland, their first defeat against them since 1997.