  Microlensing observations toward globular clusters could be very useful to
probe their low mass star and brown dwarf content. Using the large set of
microlensing events detected so far toward the Galactic centre we investigated
whether for some of the observed events the lenses are located in the Galactic
globular clusters. Indeed, we found that in four cases some events might be due
to lenses located in the globular clusters themselves. Moreover, we discuss a
microlensing event found in M22. Using the adaptive optics system NACO at ESO
VLT it was possible to identify the lens, which turned out to be a low mass
star of about 0.18 solar masses in the globular cluster M22 itself.
