Solskjaer paid tribute to De Gea who will compete a decade of service at United next summer.
The Spaniard has come in for some criticism recently, but Solskjaer believes his goalkeeping coaches Richard Hartis and Craig Mawson can bring out the best in De Gea.
"David has had some fantastic seasons here and next year is his 10th," said Solskjaer. "He's proven (former United goalkeeper coach) Eric Steele right that we believed in him.
"He had a tough ride early on with the physicality in England but he's been the best goalkeeper in the world for the last nine or 10 years, and he's still keen to learn.
"Richard and Craig have reignited a little bit of spark in David and he's working really hard in training."