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The first Gaia Data Release presents an opportunity to characterise thelow-mass population of OB associations, providing larger statistical samplesand better constraints on the formation and evolution of clusters andassociations. Using previously known low mass members in a small region of VelaOB2 we have designed selection criteria that combine Gaia and 2MASS photometry,independently of any astrometric information, to identify low-masspre-main-sequence (PMS) stars over the wider association area. Our method picksout the known clusters of young stars around $\gamma^2$ Velorum and NGC-2547,but also identifies other over-densities that may represent previously unknownclusters. There are clear differences in the spatial distributions of thelow-mass and the high-mass OB populations, suggesting either that the structureand dynamics of these populations has evolved separately or that the initialmass function can vary considerably on small scales within a singleassociation.

The low mass population of the Vela OB2 association from Gaia