Two activities, too much?

I have my son enrolled in private swimming lessons starting in August for 8 weeks. Only once a week for 30 minutes. Would it be too much to also enroll him in a 45 minute long soccer class once a week as well? He is only 2, will be 2.5 during these activities. I know kids can be over scheduled and overloaded with activities. He is not in daycare or any other structured activities.