The former Reds goalkeeper is an Anfield hero after winning four trophies in his 394 appearances for the club.
Reina said: “To make 97 points and to arrive second is just disgraceful! It's unbelievable. What else can you do to be champions?
“Credit to Manchester City also because they won their last 15 or 16 games, which is unbelievable.
“It's about time Liverpool won the league They've been working really well in the last four years since Jurgen came to the club.
Unsurprisingly he is a big fan of current No.1 Alisson who had a superb first season at Anfield last year.
“Alisson is one of the best in the world as he has demonstrated since the beginning which is not easy in the Premier League," said Spaniard Reina.
“The performances he has put in have been excellent and the way Liverpool play suits Alisson.
“He will only become better and better because he has the right quality, the right attitude, and the experience of one year already in the bank."