Ahead of today's home clash with West Ham, Lambert, 31, said: "It is only a matter of time before Jay does get a chance with England if he carries on like this.
"He is like a player reborn. At the start of the season he wasn't as confident as we had hoped he would be - but slowly and surely the confidence has come back.
"He's such a good player. It makes my job so much easier when playing alongside him, as he is on fire.
"If he carries on like this then anything's possible for him."