The Brazilian full-back believes the former Napoli coach is still the right man for the job despite the club's inconsistent campaign
The former Napoli boss has received his fair share of criticism in recent weeks as Inter have struggled to keep up with the top teams in Serie A after an impressive start to the season.
Sunday's 1-0 derby loss to Milan leaves Inter four points adrift of fourth-placed Fiorentina, but Jonathan has insisted that the players are still 100 per cent behind Mazzarri and is hopeful the club will not replace the 52-year-old in the summer.
"Inter should absolutely stick with Mazzarri. I'm 100 per cent sure we have to continue with him," Jonathan told Sky Sport Italia.
"Right now the criticism is clearly aimed at him and it's even been written that the players aren't behind him, which isn't true. We want to move forward with this coach.
"Inter have to trust him next season as well because he's a coach that instils confidence in his players. He's prepared and always wants to win, which is why he gets angry when it doesn't happen.
"A great team like Inter needs a coach like him."
Inter currently sit fifth in the Serie A table with 57 points from 36 games ahead of their final two matches against Lazio and Chievo.