  We report the discovery, based on an inspection of the OGLE-II database, of a
group of blue variables in the Magellanic Clouds showing simultaneously two
kinds of photometric variability: a short-term cyclic variability with typical
amplitude $\Delta I \sim$ 0.05 mag and period $P_{1}$ between 4 and 16 days and
a sinusoidal, long-term cyclic oscillation with much larger amplitude $\Delta I
\sim$ 0.2 mag with period $P_{2}$ in the range of 150-1000 days. We find that
both periods seems to be coupled through the relationship $P_{2}$ = 35.2 $\pm$
0.8 $P_{1}$. In general, the short term variability is reminiscent of those
shown by Algol-type binaries. We propose that the long-term oscillation could
arise in the precession of a elliptical disc fed by a Roche-lobe filling
companion in a low mass ratio Algol system.
