article_snippet.sent: Results have been impressive since David Ospina replaced Wojciech Szczesny, who had failed to show the required consistency.
article_snippet.sent: David Ospina has played 12 Premier League games; Arsenal at Wembley have won 11 and David Ospina has kept six clean sheets, but Arsenal manager Arsene Wenger still needs to buy a new No 1 if six clean sheets are to be title challengers.
article_snippet.sent: Arsenal goalkeeper David Ospina pictured during a training session at London Colney last week .
article_snippet.sent: Chelsea goalkeeper Petr Cech warms up before Saturday's Premier League clash against Manchester United .
article_snippet.sent: Danny Welbeck looks to evade the challenge of Reading's Hal Robson-Kanu (centre) and Alex Pearce .