Chelsea defender Alex believes the Londoners have hauled themselves back into the Premier League title race after an unconvincing start to the season.
The Blues were thrown into turmoil in September when Jose Mourinho left Stamford Bridge, with director of football Avram Grant named as his successor.
Despite the upheaval, they have lost only one match - at Manchester United - since Grant took over and now the Israeli has been rewarded with a new four-year deal.
On Sunday, Chelsea travel to the Emirates Stadium just three points adrift of opponents and league leaders Arsenal.
"We went through a very difficult period," Brazilian defender Alex told the club's website, chelseafc.com.
"There was great confusion for everybody. We were all very used to Mourinho and he was a great man who helped me a great deal.
"There was a lot of confusion and it did make a difference. We dropped points, particularly at home when he had some draws.
"But, gradually, we are creeping up and keeping in touch with the leaders, which is the most important thing."