Jose Mourinho believes it will be "impossible" for his Chelsea side to keep Arsenal playmaker Mesut Ozil quiet for the entirety of Monday's top-of-the-table clash at the Emirates Stadium. Ozil's seamless arrival in the Premier League from Real Madrid, where he played under Mourinho, has "completed the puzzle" for Arsene Wenger's Arsenal, the Portuguese believes, firmly establishing the Gunners as title contenders. Mourinho said: "He arrived, Arsene gave him the shirt, immediately he starts playing and immediately the team becomes better. "He's a phenomenal player. He's one of those players that you buy and you complete the puzzle of your team." It was Mourinho who signed Ozil for Real - from Werder Bremen after impressing at the 2010 World Cup - and the Chelsea boss suggested the Germany forward has no faults in his game. Chelsea boss Jose Mourinho has revealed he spoke to Andre Villas-Boas following his sacking at Tottenham and has told him to move on swiftly from his departure. Mourinho spoke to his fellow Portuguese after Spurs cut their losses on the former Chelsea manager on Monday, relinquishing him from his duties in the wake of the 5-0 loss to Liverpool. "I spoke with Andre in the last six months; I spoke with him three times," Mourinho said.
Asked whether he was surprised Wenger spent such a figure on one player, Mourinho said: "It's improved his team. There are many ways to improve your team. "One of the ways is to work young people and give them time to grow up and to improve. "Another way is to go directly to the market and buy an end product in the top moment of their careers. They had the chance to do it with Mesut and they did it very well." Mourinho believes it is necessary to both recruit leading players and nurture young talent to be successful. "If you are just building, building, building, probably you're not going to get there," he said. "He got an important player that's changed his team clearly. Mourinho said: "I know his strong points. Not the weaknesses. "I think I know how to try to stop him to be in the game (for) 90 minutes, with 90 minutes of direct influence. "But it's impossible to stop him for 90 minutes, because these kind of players they will have always a moment or a couple of moments where you cannot stop them and they end up showing why they are so good. "To stop him completely, I don't believe we can." Get 50 per cent off a Sky Sports Day Pass from NOW TV. Stream 24 hours of Sky Sports for just £4.99. Click here for more. Mourinho left Real Madrid to return to Chelsea in June before Ozil followed a similar path to London, albeit to Arsenal in a club-record deal worth in the region of £43million. "I was surprised, but at the same time I understand what Real Madrid is," said Mourinho of Madrid's decision to allow the playmaker to leave. "It's a club that needs to do by their philosophy what they did with Gareth Bale, what they did with Isco. "When you buy Isco, when you buy Bale, to keep also Mesut, maybe they made their decision because of that."