Manchester United boss David Moyes admits he has previous with Manchester City counterpart Manuel Pellegrini.
Moyes is still angry over the way Everton were dumped out of the Champions League by Pellegrini's Villarreal in 2005.
"It did rankle because we scored what we thought was a legitimate goal to take it into extra-time and it didn't count," said the Scot.
"Villarreal did have a really good team. They got to the semi-final of the Champions League that year so for us to run them really close gave me an idea of what a good side we were as well."