Good interview...like the guy but don't think we need to start talking about 40m or this or that amount. I believe his contract is only upto 2021. The club is continuously evaluating him, he has been in important games , they will know enough about him.
To my non professional eyes, he fits the bill for no 2 at Liverpool, if the clubs evaluating is the same, they will offer him an extension and thats that. If not, it still might not be worth the gamble to get a new number 2 for next season, so just let him be for another year.