Blackwell admitted going to see Clive Oliver during the interval but he maintains he was only speaking to him about a pre-match directive about quick free-kicks.
Sky Blues boss Micky Adams was unhappy about the visit, labelling it "illegal" but added that he would not be making a complaint about it.
That and the fact that it would appear that Blackwell wasn't breaking any rules by going to see Mr Oliver would seem to rule out any action by either the Football Association or the Football League.