  Galactic stars belonging to the Of?p category are all strongly magnetic
objects exhibiting rotationally modulated spectral and photometric changes on
timescales of weeks to years. Five candidate Of?p stars in the Magellanic
Clouds have been discovered, notably in the context of ongoing surveys of their
massive star populations. Here we describe an investigation of their
photometric behaviour, revealing significant variability in all studied objects
on timescales of one week to more than four years, including clearly periodic
variations for three of them. Their spectral characteristics along with these
photometric changes provide further support for the hypothesis that these are
strongly magnetized O stars, analogous to the Of?p stars in the Galaxy.
