Think there was something similar in a home game where Blackburn scored ( previous season ) where Wilson had one hand on the ball and the Blackburn player scored. The ref after giving it consulted with the linesman and disallowed it.
I'm a bit late but just today seen ref watch and Dermot Gallagher said that there is a rule that says once a keeper gets a hand on the ball ( on the ground only ) they are deemed to be in control.