Early detection and control of invasive mosquito species (IMS) at points of entry (PoEs) are of paramount importance to slow down any possible establishment. Preventive actions are however more difficult to sell to gouvernments than reactive actions. Since 2007, IMS monitoring actions in Belgium are project-based and short-term without a future guarantee. Based on available literature and experiences from Belgium and neighbouring countries, a recommendation for a cost-efficient long-term IMS monitoring programme was made. We reviewed the different important factors to take into account: the PoE s to be surveyed, the collection methods to be used, the options to decrease the workload and the costs. Following recommendations were proposed to the Belgian authorities in 2020: The targeted IMS should be Ae. albopictus, as it is posing the highest risk for human Aedes-borne disease transmission in the near future. Active monitoring should be supplemented by passive monitoring. Citizen science should be implemented at less-defined PoEs, such as camping places, cities, and a PoE-targeted citizen science at less important well-known PoE s (ports, airports and the flower auction). To cover the full Ae. albopictus introduction or activity period, active sampling should be carried out between mid-April and end-October. From a practical and feasible perspective, active monitoring should focus on the 10 most important high risk PoEs. Yet, a yearly evaluation of these and potential new high risk PoE s with new data on import origin, frequency and volume is important. To follow the spread along the highway, it is also recommended to actively monitor the next main parking lot following an Ae. albopictus positive parking lot. A sampling design is developed using BG-Sentinel traps, oviposition traps and larval sampling. Some alternatives are given to make it even more cost-efficient. Collaboration with local partners at the PoE or colonised area is essential. Finally, a sustainable, structured and long-term IMS management programme in Belgium should not only integrate active and passive entomological surveillance, but also vector control and Public Health surveillance. Anno 2022, a large part of this recommendation was followed, but there is still room for improvement.