Foster, 36, has not featured in at any point in that run, with Javi Gracia opting for second-choice Heurelho Gomes who appears to be in his final season in football.
Sterling grew up just a few miles away from Wembley and is desperate to win his first FA Cup winners' medal. For his part, however, Foster has made his feelings on the situation clear.
The Englishman did get a goal and an assist the last time the teams met in the FA Cup, five years ago, but neither happened while Kompany was on the pitch: the Belgian came off the bench at half-time with his team 2-0 down and inspired them to win 4-2.
"We can win the English quadruple on Saturday so it's a great chance for us".
"I accept that we want to be there and deserve to be there but to be the best ever?"
Subscribe to Squawka's Youtube channel here.
He says he expects to retire after his Wembley appearance but Watford are keen to renew his services for one more year.
If a ban is the punishment decided, City would have the right to appeal to the Court of Arbitration for Sport (CAS) in Switzerland - which makes it highly unlikely of the ejection happening in time for next season's campaign should the Premier League champions be found guilty.
But there's a growing sense that this Man City team is so good that they are actually being under appreciated.
However, if the outcome of the investigation is indeed that City are unable to play in the Champions League for a season, then they would miss out on a massive sum of prize money and performance related bonuses as a result. The Frenchman will look to cut-off Man City's passing lanes in midfield, and will hope to protect the defence.
Meanwhile, Guardiola said he wants Leroy Sane to stay at Manchester City but says the German winger, whose starts were limited during the team's stretch run, is no closer to signing a new contract. I remember watching FA Cup Finals when I was younger in Catalonia and it always looked so handsome and inspiring.
"The big competitors are like this".
"I think the best team outside of the top six is Leicester", he added. They have a lot of young exciting talent. In tennis, basketball, golf, they want more and more.