I have a deck which was built and the footings were never put in concrete, any way of correcting w/o teardown?

The home I have has a deck which was built around a pool. I just noticed that none of the footings were placed in concrete. is there anything I can do about this now? The deck seems very sturdy. I guess it has been up for about 3 years now and no problems as of yet. I just would like to reinforce it if possible. There is a iron fence which was left up and the 4 x 4 beams were attached to the iron fence for support as well as sunk into the ground. I just don't see the normal footing cement tube you normally see. Thanks