The Belgian made just two appearances behind the Brazilian last term.
Mignolet accepted his situation would not change and moved on last summer to join Club Brugge six years after arriving at Anfield.
“If I could really fight for my place, I might have stayed,” Mignolet told Het Belang van Limburg.
“But if I had ended up in goal if Alisson picked up an injury, I would be allowed to push 10 shots out of the box.
“Then Alisson could immediately claim his place again, and even if he pushed the ball into his own goal, he would still stay [in the starting XI]. What sense did it make for me?”
And Mignolet has no regrets over his move, either, insisting there were no more opportunities left for him.
“No, because I knew that the opportunity existed,” he added. “I haven’t thought once: ‘S***, now Liverpool is in the Premier League race and I’m gone’.
“Of course, I could have stayed with Liverpool to earn my money, challenge for the league title and the Champions League.
“However, as long as you are not on the starting XI yourself, a price feels different. So I would rather play in the starter at Club Brugge than grabbing the English title as a substitute at Liverpool.”