City beat West Ham 2-1 at the Etihad Stadium on Saturday, while Sam Allardyce re-iterated his desire to conclude a permanent move for Hammers goalscorer Andy Carroll
Goals from Sergio Aguero and Yaya Toure secured the win five days after rivals Manchester United won their 20th league crown - but Platt says City will target victory in all of their remaining matches as they look to confirm second place in the table.
"It was the response we expected in the sense that this football club has got to a point where we are obligated to win football matches,” said Platt. "We've got to secure second place as soon as we mathematically can.
"We all expected Manchester United to get over the line at some point. We came into this one today and didn’t expect anything different from the group of boys we’ve got than for them to produce a performance."
City dominated the game and should have been further ahead before Andy Carroll scored a late consolation for the Hammers in the final seconds of added time.
It was the on-loan Liverpool striker's sixth goal in nine games and West Ham manager Sam Allardyce re-affirmed his desire to complete a permanent transfer for the forward in the summer.
Allardyce said: "We'll find out at the end of the season if we can sign him. We'd like to, but there's a lot to sort out between us, Liverpool and Andy. He scored again today so that's six in nine now.
"I think we could have snatched something. We played more to our potential in the second-half, in the first half we showed a little bit too much respect for Man City.
"Unfortunately when we did score it was too late."