I would use epoxy
. Hard to tell from the photo
but if you can't get a clamp top and bottom over the glued area then a heavy tool box on top will work.
Put a flat board under the box to spread the load and get an even compression
. In fact use a board top and bottom even if you can get a clamp around the spot but then you probably already know that.
I would also mix a little extra and seal the entire edge of the counter to keep it from further damage.