I also think chelsea's main target now should be to do well in the Premier League. The EFL Cup is not very important. Although Chelsea have performed well in the last few matches, they are currently sitting in tenth place in the Premier League points table. They should definitely try to climb to the top of the table. Although the brenford team is not strong, there is no way to underestimate this team. Chelsea will have to play well if they want to win this match. Chelsea's full focus should now be on the Premier League fixture. If not, there is no possibility to see the team in the top 5/6 of the points table. But Chelsea's performance against arsenal was good enough. So it is expected that they will win against Brainfort.
Chelsea remaining eight points left behind Liverpool as latest standings teams for UEFA Champion League spot, current well performed from Chelsea its not guarantee easily to raise top fourth standings position behind Chelsea have match left with top standings teams such as Manchester City and Tottenham Hotspur. Next match Brentford is not really difficult opponent teams for Chelsea and three points most essential if want move to higher position.
Chelsea must focus only with Premier League if want return their opportunity for playing in Champion League next season, its looks disappointed with Chelsea performed can't settle to the top fourth placed and not get chance with Champion League participants.