How long have you been down for? Are you fully healed?
If you are fully healed just a couple of rides should be good and you can ramp back up to tempo and sweet spot. Depending on the duration of your time off the bike you may need to dial back your FTP. Sweet spot is good because it is not as physical exhausting and you can recover from it easier, even when out of shape.
After two of weeks of zone 2, sweet spot, burst, crisscross workouts you should be more than ready to continue with your plan. Of course this is dependent on being healed fully.