The quest to discover exoplanets is one of the most important missions in astrophysics , and is widely performed using the transit method , which allows for the detection of exoplanets down to the size of Mercury . However , to confirm these detections , additional vetting is mandatory . We selected six K2 targets from campaigns \# 1 to \# 8 that show transit light curves corresponding to Earth-sized to Neptune-sized exoplanets . We aim to discard some scenarios that could mimic an exoplanetary transit , leading to a misinterpretation of the data . We performed direct imaging observations using the SPHERE/VLT instrument to probe the close environment of these stars . For five of the K2 targets , we report no detection and we give the detection limits . For EPIC 206011496 , we detect a 0.38 \pm 0.06 M _ { \odot } companion at a separation of 977.12 \pm 0.73 mas ( 140.19 \pm 0.11 au ) . The spectral analysis corresponds to an M4-7 star , and the analysis of the proper motion shows that it is bounded to the primary star . EPIC 206011496 also hosts an Earth-like planetary candidate . If it transits the primary star , its radius is consistent with that of a super-Earth . However , if it transits the companion star , it falls into the mini-Neptune regime .