the clay pot may or may not be a problem. as someone above mentioned, if it was never used before it may be ok. I know some growers here in Atlanta that use clay pots ok.
I would think a bigger problem with clay (assuming they are new) is that the clay will let the water evaporate out the side so your plant dries out way faster.
For all those reasons, get some cheap plastic pots and repot. I personally don't think repotting a sarr, even in growing season, is that hard on them. You can be sneaky any they don't notice ;)