With Real Madrid already 10 points behind the Catalans, it seems a tall order, but Alonso was convinced.
"There is a lot of the league left," he said. "And in a short time everything can change.
The former midfielder also defended Cristiano Ronaldo and said he sees Real as favourites in the Champions League again.
"Cristiano Ronaldo will decisive in the big moments," he continued.
"I see him as always; with desire and enthusiasm to continue scoring goals and winning titles.
"Real Madrid were always the favourites because they've won the last two."