You can start doing ice baths on those calves after any session if you can afford the time to do this.Even better do the entire legs. Speed days you could do contrast baths as well. I would also look into a travel roller and you can use this everywhere. ( google it)
You need to start getting after that calf issue and I would bet your hams are also tight etc as I was just responding to Pakewi. If you want to keep playing soccer start resisting more work and you will notice the results. Massage is great but you can do a lot of things to work around this for now. I think you might not need to replace an entire day of sprinting with the explosive med ball drils but you could emphasize on alternating days and see what brings the best result. First you do the warm up, not sure if you do power speed, then your explosive med ball stuff and you can end with some sprints to keep the feel. The next speed day straight speed / no explosive med ball/ next speed session after that again repeat what you did speed session before last. Another way to do this might be each speed day you do both but graduate the emphasis of one or the other over time depending how you are doing things. I would not go too far away from the speed at any one time so much. You should be able to feel how the speed is coming as a result of the med ball drills. You must watch the volumes of your speed. Repeat only what feels great. If you have any question likely you needed to stop one or two reps before. Next time you will know how to adjust the volume.