The director, who worked on the first two instalments and recently was back for 'X-Men: Days of Future Past', has been attached to the position since a while but now he has closed the deal with 20th Century Fox, reported Deadline.
Singer's position in 'Apocalypse' reportedly was in question after a lawsuit alleging sexual abuse was launched shortly before 'Days of Future Past' premiered. The lawsuit, however, was dropped last month.
'X-Men: Apocalypse' is set to take place in the 1980s. James McAvoy, Michael Fassbender, Jennifer Lawrence, Hugh Jackman and Nicholas Hoult will reprise their roles as Charles Xavier, Magneto, Mystique, Wolverine and Beast respectively.