Alisson has become the latest Liverpool star to commit his future to the Anfield club.
The Reds announced a "new long-term contract" for their goalkeeper on Wednesday, with the deal widely reported to run until June 2027.
Alisson has joined Trent Alexander-Arnold and Fabinho in penning an extension ahead of the new Premier League season.
"I think I didn't waste too much time to think about that," the Brazil international told Liverpool's official website.
"It's something we just built in those last three years, the confidence, the trust that I have in the club and the club has in myself.
"Me and my family, we are really happy here. My kids are settled in England, in a different country, but they are growing up in that way. So, we are really happy.
"I'm really glad that I can keep going on with my work here, doing a good job here. So, I'm really happy to make this decision – that is not hard for me."
The 28-year-old joined Liverpool from Roma in 2018 and won the Champions League in his first season in England.
The Reds followed up that success by ending a 30-year wait for a domestic crown with their 2019-20 Premier League triumph.
Since his signing, Alisson has played exactly 100 times in the Premier League and kept 44 clean sheets – fewer only than Manchester City goalkeeper and international team-mate Ederson.
Among keepers with 50 or more appearances in the competition over this period, Hugo Lloris (74.7) is the sole man with a save percentage better than Alisson's 73.6.
The Liverpool star also memorably scored a late winner at West Brom last season that kept his side's Champions League qualification push on track, but he now has loftier ambitions.
"We have to set goals and we have to set them high – winning everything that we are playing [for], the Champions League, Premier League, the cups, everything," he said. "I think we can start from there.
"But obviously winning depends on what we will put on the pitch, what we will give on the pitch and we have to give 100 per cent at least. If we can push harder, we will go."
Liverpool's 69 points last season was the fifth-lowest total by a defending Premier League champion, but only City (32), Chelsea (36) and Arsenal (39) conceded fewer goals than the Reds (42), who had to deal with numerous defensive injuries.