Janssen's Marshal archetype suggests a player with strong technical ability and vision, but his limited creativity and guile are concerns, and he would thrive in a possession-based system that values discipline and build-up play, where his build_up_contributor trait can be leveraged, and a club looking to develop a young, technically-gifted midfielder would be a good fit, although his lack of physicality and athleticism pose risks, and a team requiring a more dynamic, box-to-box midfielder may not be the best match, but his hot-headed trait may lead to disciplinary issues, and his high_press trait suggests he can excel in a high-intensity system.