Vincent Kompany, trailed by the cameras of Manchester City's in-house television station, was with his family.
United beat West Brom 2-1 in the reverse fixture earlier this season with goals from forwards Romelu Lukaku and Jesse Lingard and Foster said the league's basement club had to be wary of the threat posed by Jose Mourinho's side.
It's been nearly inevitable for the whole of 2018 but Manchester City have today sealed the Premier League title without even kicking a ball on Sunday afternoon. West Brom are the bottom team and that indicates how important and decisive the game will be for them; they need points.
"I have won titles".
City had won nine consecutive league matches, a club record for a single season, to open up an eight-point lead at the top. During the week I was trying to fight that and you could see the difference in attitude today, one more touch, one more flick.
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Although, observers know that it was a matter of time before City is crown the champion of the lead.
The 2012 title win had the infamous last-gasp goal by Sergio Aguero. "The Premier League is so, so tough", Guardiola said.
There were a few half chances here and there, but West Brom smiled home as winners on the day, but Manchester City would surely be the biggest beneficiaries.
And then West Brom, the worst team in the league, went and scored. The Spaniard has accumulated 16 clean sheets in the Premier League and will be looking to add another one, as he chases his first Golden Glove award.
Given that they have won only three of their 33 league matches this season, it is clear that they are going down.
City defender Benjamin Mendy, who missed most of the season due to injury, turned social media blue as he tweeted: "We are f*****g champions congratulations boys!" I dont' think we deserve to lose but we gave them the opportunity to win the match by being solid in defensive and smelling a chance from set play.
The three-man midfield formation worked very well for Manchester United last weekend against City and Mourinho is likely to go into Sunday's game with a similar setup, meaning Ander Herrera starts once again in the middle alongside the consistent and reliable Nemanja Matic and United's hero from the last game, Paul Pogba.