The Manchester United striker is suspended for the Euros clash.
But Sagna told the Daily Express: "Wayne Rooney is England's main striker, so of course it is good for France that he is not playing. (But Theo Walcott and Alex Oxlade-Chamberlain) are ready to shine for England.
"Both of them are very quick and can change games on their own. I know they will have a good tournament, so I will make sure everybody in France is aware of them."
On England's chances, he added: "The fact they have not got much time for the new manager to get his ideas across could make the team stick together even more.
"They have very good players in every position. It will be a very good game to watch. You know that playing the England team is never easy and it will be a very difficult game for France."