Heskey added: “Going back to an old club is always an interesting one, isn't it? There's not many players that have gone back to a club and really lived up to expectations.
“I know Thierry Henry had a short stint back [at Arsenal] and that went well, but you're not the same player and Jack Grealish isn't the same player because he's played in a different formation, a different role, a different strategy than what it was when he was at Villa.
“Villa are not the same side or the same structure as when he left as well. So it'd be an interesting one that if he ever did go back, where would he fit within that? Where would he play? Because again, we look at Pep Guardiola’s way of playing and it's very structural. You've got to stay in your areas.
“However, Unai Emery is pretty similar, you've got to work his work rate and you've got to stay in the structure that he's put out. So it would be interesting to see it. I wouldn't call for him to go back there because there'll be certain expectations from Villa fans that the Jack that left is the Jack that was coming back, but it's not the case.”