Manchester United boss Louis van Gaal was delighted with his side's top class performance against Queens Park Rangers but still believes there is room for improvement.
The Red Devils scored their first win in the English Premier League and moved up to ninth place in the table, seven points from leaders Chelsea.
Angel di Maria opened the scoring with Ander Herrera, Wayne Rooney and Juan Mata also on the scoresheet in what was a scintillating display by van Gaal's side.
"We always have to analyse what we have done," van Gaal told Sky Sports.
"Of course the result is fantastic but we can do much better, I believe
"It's a very good start. I said before the game, 'Let's make a new start again'.
"Since 1st September, we only had three days together before the game with the internationals coming back and with the jet lag, like Falcao.
"I think the result is fantastic, but we can get better. We have made a very good new start."
"When you have a result that is 4-0, you can be happy.
"As a coach you always have points that you can improve. I said that at half-time and also after the match.
"But I am very happy with the result because of the way we have played. We were very dominant and we scored goals. A clean sheet is also very important."