Question: What is the Portuguese football agent whose clients include the manager for the Premier League club Manchester United, often referred to as?
Sentence (from "2011–12 Premier League"): City finished level on 89 points with Manchester United, but their goal difference was eight better than their local rivals', making it the first time the Premier League had been won on goal difference and the first time a club previously relegated from the Premier League had won the title.
Relevant evidence: No