Dip in bottom of pool

[nickabee]

I have 24' above ground pool I noticed that a dip has formed in the bottom next to the edge where my pump is hooked up Im guessing this is from pool getting too full and water poured out and made the sand under pool shift. The dip is about 10" across and about 4" deep is it possible to fix this with out draining the pool? Can I just put a patch over this area to reinforce? At this time there is not a tear. Please advise.