The Spain midfielder and defender ruptured the cruciate ligament and another ligament in his knee during the German Super Cup game against Borussia Dortmund in August.
He said that the directive was given to the service late on Saturday as the country needed to resume activities within and across its land borders which had been closed since Wednesday.
The News Agency of Nigeria (NAN) reports that the voters kept vigil till 2.45 a.m. on Sunday to monitor counting of the ballots and hear the result of the polls at the unit.
Buni, who made the remark in an interview with the News Agency of Nigeria (NAN) in Damaturu on Sunday, urged the Independent National Electoral Commission (INEC) to respect the people's choice.
The Deputy Head of Delegation of the EU observers, Mr Richard Young, gave the advice in an interview with the News Agency of Nigeria (NAN) in Abuja.