Subscribe to our channel: https://goo.gl/pqS0mLOle Gunnar Solskjaer on perfect start as Manchester United manager. Ole Gunnar Solskjaer saw his Manchester United side thrash Cardiff with five goals in his first game and said: 'Football is easy if you've got good players.' Jesse Lingard scored twice, with Marcus Rashford, Ander Herrera and Anthony Martial also on the score sheet as United scored five for the first time since 2013, when Sir Alex Ferguson was manager. After replacing Jose Mourinho, who was sacked on Tuesday amid dressing-room unrest following a series of public criticisms against them, interim manager Solskjaer got the same side playing with freedom. 'They are a great bunch of players and their quality is unbelievable,' said Solskjaer. 'I arrived on Wednesday night and only had Thursday and Friday with the players. 'Wayne Rooney text me and gave me some advice —so it must be down to him! He told me to make them play football, enjoy themselves and be Manchester United.' Indeed, in his capacity as a pundit for BT Sport during the game, Rooney said it was right that United sacked Mourinho. 'Something had to change. It was the right decision [to sack Jose],' said Rooney. 'I stay in touch with a lot of people at the club. I speak to them quite a lot. 'To be a successful club you need to have everything right. That relationship between some of the staff and players wasn't great. Bringing Ole and Mick in, that will change things. 'The staff are smiling and happy and that rubs off on the players. I think it's a good move for the club and gives them more time to get the right man in the summer. Some of the players need to step up.' Asked what he had worked on in such a short time, Solskjaer added: 'We had a session yesterday [Friday] about patterns of play and we wanted Ashley Young and Luke Shaw to push on more, it worked out well today. 'Your work-rate is the easiest thing to work on. It is free. It is the attitude and application of the boys. If we approach all the games like this — and we want them to approach them all like this — with combination play and playing the ball forward then I'll be happy. 'The foundation was in the defending. I thought the two centre-backs and two full-backs were brilliant.'