The South African admitted he had been a little bit under par so far this term because of a shortened pre-season.
But he now feels he is back up to 100 per cent and ready to show it on Saturday.
"When you come back for pre-season and join a team late you have to catch up," Pienaar told evertonfc.com.
"When I went to the World Cup I was feeling tired but now I feel much better. It is down to the players if they have the desire to push themselves the following season and I think all the players that came back have that desire to do well."