WFC3 JH colour composite of the Quintuplet cluster (left panel) and Arches cluster (right panel) covered with both HST/WFC3 and NACO observations. The NACO fields are shown as boxes. L-band excess sources detected in both clusters are overlaid as circles. Previously detected excess sources in the Arches are shown as smaller cyan circles. Excess sources in the cluster centres are circumscribed in blue for clarity.