The Frenchman has appeared as a substitute in the Magpies' last three games after finally shaking off a hamstring problem which had previously allowed him to start just one game since December.
But with relegation fears lingering, Ben Arfa says he is ready to help drag Alan Pardew's side further clear of relegation trouble.
Speaking in the club's matchday programme ahead of Saturday's clash with Liverpool, Ben Arfa said: "My hamstring is completely fine now and I feel happy that the injury has gone and I can return to full fitness. I am 100 per cent fit.
"I'm happy that I have come back into the team slowly and gradually. The manager and the doctor have put in place a programme to ensure I return gradually rather than rush back and get further problems in the future.
"I am happy with the work of the backroom staff and the manager because this was my first muscular injury and it was important that the healing ran its
Newcastle head into the weekend six points clear of the drop zone with four games remaining.