Umar was selected for the Twenty20 and One-Day International (ODI) squads on the tour. Pakistan plays the first of two Twenty20 matches in Harare on August 23 before playing three ODIs and two Tests on the tour.
The PCB said on Saturday that Umar had been called back from the West Indies for fitness problems. Local media had initially reported that Umar was suffering from a back problem.
“Umar has immediately been called back,” a PCB statement said.
“He will undergo a complete medical examination to reassess the level of his fitness, meanwhile the national selection committee has proposed the name of Sarfraz as his replacement for Pakistan one-day and T20 squads for the upcoming tour of Zimbabwe.”