"I think it was the first time we were able to have this kind of attitude, let's say. We signed the Concorde Agreement, the budget cap.
"But then, when we came back to the reality in July, we had the 17 races to do in five months, for sure it was tough."
Alfa Romeo finished the season above only Haas and Williams in the constructors' standings, although rallied to be more competitive in the second half of the season and compete at some races with the tail end of the midfield.
Vasseur expressed his pride for his team's reaction to the difficult first half of the year to be able to perform as they did later on.
"The first motivation for the team is you need to get results because the Monday morning is always easier when the Sunday went well," he explained.
"With the very tough start to the season we had, I am quite proud of the reaction of the team.
The first four or five events were very difficult for us but the reaction was okay and now we have to be focused on the future."
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