In this study, we examine how support workers produce requests for concrete actions and, in this way, manage client participation in mental health rehabilitation. Drawing on Finnish rehabilitation group meetings as data and on conversation analysis, we examine how support workers design their requests for concrete action from clients, how clients respond, and how support workers deal with clients’ responses. The results reveal that support workers tend to use verbs indicating willingness when implementing their requests, whereas clients resort to the modality of possibility. By orienting to willingness, the support workers invoke clients’ sense of responsibility to contribute to group activities and simultaneously avoid questioning their capabilities. On the other hand, clients orient toward the underlying assumptions of social responsibility rather than to their own personal preferences. To conclude, our study demonstrates how support workers address the dilemma of increasing client participation and showing respect for client self-determination.