By Joe Brewin

Arsène Wenger believes Chelsea have a “50:50” chance of progressing to this season’s Champions League final.

Roberto Di Matteo’s side hold a slender advantage over Barcelona after Wednesday’s 1-0 victory at Stamford Bridge, courtesy of Didier Drogba’s first-half goal.

Wenger says Chelsea’s home clean sheet could prove vital in Tuesday’s second leg at the Nou Camp as the Blues look to reach their second final in five seasons.

“It is a 50:50 now,” said the Frenchman. “If you look historically at the statistics of a 1-0 home win it is always a good result. If you don't concede at home and you win, in Europe that is always a good result

“They were very good at what they did, what they decided to do. They decided to defend and only to defend. When you choose the tactics they have chosen you have a 30 per cent chance to win the game.

“They took their chances so you have to give them credit for the discipline they showed, for the consistency of their focus on what they wanted to do, and the fact that they could use the weakness of Barcelona on the counter-attack and set-pieces.”

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 20 Apr 2012