Foden's 36th-minute goal was enough to secure City's position in the knock-out stages of the Champions League.
Foden has told his City teammates that they must not take the remaining two group matches for granted.
Phil Foden insists that he would like Manchester City to finish their UEFA Champions League group stage strongly after beating Olympiakos 1-0 to seal their spot in the last 16 of Europe's elite competition.
Foden scored the winning goal against the Greek club on Wednesday evening as he finished off a superb backheel from Raheem Sterling.
And, following the victory against Olympiakos, the 20-year-old expressed his joy at progressing into the next round of the European competition.
"It feels really good to get the qualification done today, we're looking forward to the next stage, but first of all, we need to finish off strong," he said.
"I always love scoring for this club, I enjoy it a lot and I'm trying to score as many as possible. It was great vision from him [Raheem Sterling] to backheel it to me, so I'm thankful for the assist."
Manager Pep Guardiola also said he expects City to improve their goalscoring as he praised his boys for the win over Olympiakos.
“Sooner or later,” the Spaniard said when asked if he thought City were close to getting back to their best in attack.
“Today we were much more aggressive to the goal. It is not easy when there are nine players defending.
“We put our wingers closer to the striker. All of them, Bernardo [Silva], Phil [Foden], Raz [Sterling], were so aggressive.
“[Benjamin] Mendy and Joao [Cancelo] were outstanding too. [Ilkay] Gundogan and Rodri as well. In general, the performance was of a top, top level.”
Guardiola continued: “Our pressing was so good. They made long balls and we won them. Our central defenders were outstanding.
“John Stones, [deserves an] incredibly big compliment because it is not easy when you have not played for a long time and alongside Ruben [Dias] they made an incredible couple. I am especially happy for him.
“Everyone was so committed. We attacked with more desire to shoot and to score the crosses.
"Now we recover as good as possible and start to focus on the Premier League.
“We made an incredible group stage.
“Especially our two games away, the second half against Porto and the first half against Olympiakos at home.
“We will see tonight the result of Marseille and Porto. We made an incredible performance.
"Unfortunately, we could only score one goal, but the team is alive.”