Everton boss David Moyes wants the Yakubu Ayegbeni he thought he had signed from Middlesbrough, while Gareth Southgate aims to prove that the Nigerian made the wrong decision in quitting The Riverside.
Since moving to Goodison Park in an £11.25million switch Yakubu has struggled to build on a debut goal against Bolton and last Sunday failed to make Moyes' starting XI.
Yakubu did, though, score against Sheffield Wednesday in a Carling Cup clash in midweek and is expected to figure against Boro on Sunday.
"I thought he was a bit anxious on Wednesday and probably made some poor decisions with his shots, some of them were ridiculous long-rangers," said Moyes.
"But it was good that he got a goal, and hopefully it will just settle him down a little bit.
"I'm sure he'll be more fired up, just as most players are against their former club.
"Sometimes it happens to players adversely, though, because they know enough about you that they know how to handle you, so sometimes it can work to your advantage and sometimes it doesn't.
"But if you can pull out all the stops in one game then I think you should do it in every game. I'd have to say that you should play every game as if it was going to be your last."
Boro boss Southgate was loath to lose his leading marksman in the summer and he believes his players will be determined to get one over a former team-mate.
"Yak has got a lot of friends here, so whatever happens, we remember him as being a good colleague - but that sentiment goes out of the window for Sunday.
"He will obviously want to try to do well, but it's about us taking on Everton as a team.
"We know what Yak's strengths are and we know what his weaknesses are, and we will be prepared for that.
"As I said when he left, we wished him well, we remember the good things he did for us, but we want to beat him because in the end, he did not want to stay with us.
"The lads will probably have a point to prove on Sunday."