Some good advice above. If the "flooring" being removed exposed the joist, then you are maybe talking about t&g subflooring and not finished flooring. Olden days they used one or two layers of this, run diagonally. Finished flooring could then go over it. The easiest way to gain support under it is to slip a board or two into the hole and have it push up on the underside of the adjacent flooring. Your new patch pieces will then rest on top of them. You attach your underneath pieces with epoxy to the underside of others. While drying support with string loop slung around it and back up through hole and put a scrap wood through the loop, twist like tournequit. After it is dry then put in patch pieces like picture drawn in previous post. You can just glue them in.
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