Brentford scored three goals in the second half by Jaidon Anthony, Igor Thiago and Fábio Carvalho to get a resounding victory. With Alonso's Chelsea, they are going through a 3-match winless streak in the Premier League after losing to Arsenal, drawing with Hull and then losing to Brentford.
After the match, Alonso said: "I think we have lost the stability and necessary competitive spirit in the second half. Small details can be decisive. You don't need to yield in matches like this, the opponent will have a lot of advantage.
The match lasted about 95 minutes and we could not maintain that form throughout the match. That is what we need to do better.
Meanwhile, defender Colwill said that Chelsea has been "overwhelmed" in set pieces. Since last season, Chelsea has conceded 23 goals in the Premier League from set pieces (not penalties). They are the team with the most goals conceded of this type along with Bournemouth.
He said: "The match was really difficult. Perhaps we revealed too many loopholes when we were down 0-1 and they counter-attacked, which they are very good at.
In the second half, we didn't play well enough. We still have a lot of work to do during FIFA Days. Perhaps sometimes we are overwhelmed in set pieces and we have to improve that.
Coach Alonso completely agreed with Colwill. He added: "Not just set pieces, we need to improve the stability of tackles, defense, and attack deployment. When conceding first, we still have opportunities, but when we lose stability, the team will lose control.
Therefore, to understand the match, know what needs to be done to be able to compete best in the matches, it is a whole process. Chelsea players need time to feel that.
In the defeat to Brentford, Chelsea did not have the service of captain Reece James and especially striker Joao Pedro. But according to Alonso, their absence is not an excuse for the defeat.
He said: "The problem is not finding excuses. We need to look at each other and understand that we must make more efforts and improve because there is still a long way to go. We created many opportunities, but lacked accuracy in finishing. That is why we did not score.
