"The last 10 seasons we have been playing a lot of games, the Premier League isn't easy, you need to fight hard".
For the first time since his 2011 arrival from Atletico Madrid, however, De Gea's performance have become a legitimate cause for concern among supporters.
He told the Sunday Times: "The team started the season really well and expectations were raised because they went 12 games unbeaten and were top of the table".
United had been on top and Lukaku was denied an early goal by keeper Kepa, who saved at his near post after the former Chelsea forward had drifted between centre-backs Luiz and Rudiger.
"Tactically, we are improving".
He added: "David has been unbelievable". This is a game that they will be favourites before as they will be going up against a United side who have recently suffered heavy defeats against the likes of PSG, Manchester City and Barcelona in the Champions League.
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The Italian said he will accept his £8,000 fine from the Football Association for straying out of his technical area in Monday's 2-2 Premier League draw with Burnley at Stamford Bridge.
Rashford will be a doubt for the trip to Huddersfield on Sunday but Solskjaer insists De Gea is set to keep his place despite making a mistake leading to a goal for the fifth game in a row.
That is joint-highest among Premier League goalkeepers, along with Arsenal's Bernd Leno and Bournemouth's Asmir Begovic.
De Gea, 28, is in the midst of plenty of speculation regarding his future as his contract situation rumbles on, and it would be a little too easy to point to that being the main reason for this poor run of form. Moreover, when his greatest asset - shot stopping - begins to fail him, he suddenly looks ordinary. "He knows he could do better with their goal but it's one of those things again". "But the second half was just a scrappy game, we never got the quality from either team".
"For us it was impossible to cover completely the gap, but at the end of the third season, we were very close to doing it".
Nowhere is that more in evidence than in the increasingly maladroit chase for Champions League qualification.