Robbie Keane could be back to skipper Ireland against Kazakhstan on Tuesday night after he resumed full training today.
The Irish squad trained in Malahide this afternoon with no injuries to report from Friday night’s defeat to Germany.
Richard Dunne and John O’Shea also returned to train with the squad after being suspended for the Germany game.
"I am hoping he is fit for selection."
Celtic's Anthony Stokes played the lone striker role at the Rhein Energie Stadium in Cologne and on another night could have emerged with a hat-trick, and he would appear to be the leading candidate for the job once again if Keane did not make it.
King's resources were boosted following his squad's return from Germany when defenders Richard Dunne and John O'Shea, who were suspended for the first half of the double-header, joined up.
King said: "They are all good and looking forward to it. It's good to see them in and added to the squad.
"We will do a little bit of training (on Sunday) afternoon and we will see. There are a few tired legs, a few tired bodies, few tired minds, and there's a few anxious and fit-as-a-fiddle minds as well, so it's a combination of things we have to deal with."