London: Thibaut Courtois believes "bad luck" is the reason behind Chelsea's nightmare first half of the Premier League season, ahead of their crucial Champions League encounter with Porto tonight.


Chelsea 'keeper Thibaut Courtois. Pic/Getty Images

The Blues have now lost eight of their 15 Premier League games following Saturday's 1-0 defeat to Bournemouth and sit 14th in the table, just two points clear of the relegation zone.