The recent successful observations of microlensing by optical interferometry opens new opportunity for accurate determination of microlensing parameters such as the mass and distance of the lens. The GRAVITY+ project (pending construction decision) will enhance the capabilities of ESO's Very Large Telescope Interferometer (VLTI), increasing greatly the number of observable microlensing targets. I will present the current status of VLTI and its future capabilities proposed by the GRAVITY+ collaboration. Microlensing is part of the GRAVITY+ identified science cases, opening the possibility to detect single stellar mass black holes.