Mesut Ozil might have been in good form since returning from injury this season , but he still needs to be better if Arsenal are to challenge for the title , according to Gunners legend Gilberto Silva . The Brazilian , a member of the Gunners ' Invincibles team , labelled the German 'slow ' and says he has to be more decisive . Gilberto acknowledged Ozil 's quality , but insists that he needs to start paying off the faith Arsene Wenger showed by spending £42.5m to bring him to the Emirates Stadium from Real Madrid . Mesut Ozil has not found things easy since moving to Arsenal , but has improved recently . Ozil has a shot deflected over the bar against Everton , and Gilberto Silva says he must offer more . 'You speak about Arsenal and how they do n't spend big money on a player often but they did with ( Mesut ) Ozil and it is always a bit risky , ' he said . 'Coming from Spain it is tough to adapt , it does n't always happen straight away . ' I do really like him as a player but sometimes in the game he does look quite slow , although he has that quality to change the game . 'He can be more decisive for Arsenal for the quality he has , he can be much more decisive for the club . Arsenal have not won the Premier League in the 11 years since Gilberto and his team-mates went unbeaten , and the 38-year-old believes they still do n't have the financial firepower to challege Chelsea and Manchester City . Gilberto was a key member of the Arsenal team that went an entire Premier League season unbeaten in 2004 . Arsenal have not won the title since their Invincible season , but Gilberto insists it is now time to challenge . But Gilberto also stressed that the club should be aiming for the title , and given time Arsene Wenger can lead his current squad to glory . 'Arsenal has n't been able to compete with Chelsea and Manchester City for a few years because they spend money on big names and this is not the Arsenal culture ' , said Gilberto . 'They do n't spend a lot of money to sign players but apart from that it is not easy to find a way to get back on track to win titles . Ozil is the Gunners record signing , but in general the club has not tried to compete with rich clubs financially . The German playmaker will need to improve if Arsenal are to mount a serious title challenge , says Gilberto . 'It was important for them last season that they won the FA Cup but a team like Arsenal need more and I hope they find a way to achieve what they always look for . 'If you look at Chelsea , they spent a lot of money on a player like Diego Costa and he has settled really well and is scoring lots of goals , that has worked for them but it is not as easy for Arsenal . 'If the players concentrate on their job and pull together they can form a strong team and try to feel good in their play . 'Sometimes people expect quick results but it does n't always work like that . ' Brazil v Chile is on March 29 at 3pm at the Emirates Stadium in London . Tickets are still available from £30 Adults/£15 Concessions at www.arsenal.com/tickets .
Mesut Ozil cost Arsenal £42.5m when they signed him from Real Madrid . Ozil has been in good form recently after a difficult first season . But Gilberto Silva says he needs to do more for the Gunners . Brazilian midfielder was part of Arsenal 's Invicible season in 2004 . And Gilberto believes the Gunners should be challenging for titles again . CLICK HERE for all the latest Arsenal news .