Speaking about manager Thomas Tuchel, Alonso said: "Since he arrived, the team took a leap tactically and when it came to defending. We are very happy with it."
He also told AS of Chelsea's Champions League title win last season: "We were a very balanced team. In these close qualifiers, the little details make the difference.
"We were a team in every way. We defended very well, we were an uncomfortable team to play with, we defended all eleven and the small details made the difference.
"At this point in the Champions League everything is very even and it depends on very small details."
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