Ibrahimovic - PSG's record scorer with 124 goals in 153 appearances - is considering his options as his contract is set to expire at the end of the season.
Verratti feels the 34-year-old is still at the top of his game, as evidenced by his topping the Ligue One scoring charts with 15 strikes.
"If I was president of PSG, I would prolong his contract without hesitation," he told La Parisien.
"I know Ibra very well. I see him every day in training and, for me, he remains at his strongest."