After creating some task sequences and deploying them to some clients, there were some errors in the process and unfortunately the tasks didn't completed successfully. After making the corrections and trying to re-deploy them, the client wasn't able to receive and start them and I noticed that the clients were still stuck on "in progress" status on Deployment Status. So, to correct this situation as I didn't find any native mode on ConfMgr to do that, simply deleting the client from ConfMgr and making a rediscovery got the job done.
