City, who are currently third in the Premier League table, will be guests to Watford at Vicarage road in Saturday’s league clash.
Bony told Manchester City’s official website that Ighalo, who has 14 league goals, and Deeney should be watched closely.
“Every game is difficult but I think we are the team that should win,” said Bony.
“We will try to go there and take the points and do what we know we can. With luck, we expect to win the game.
“Ighalo and Deeney are both in good form now and as a striker, when you are in good form, everything can happen. In six months, you can score 20 to 25 goals. We have to be careful of what they can do and know that they are in great form and can score at any moment.
“We have to be ready and be prepared for this game.”