"There's always been speculation about my club involvement," Kewell said in Sydney on Tuesday. "Apparently my agent did it (a deal with Portsmouth) while he was on the plane coming over to Australia, so I don't know how he's done that.
"My options are open and we'll see what happens."
The former Leeds star remains confident of his own abilities, however, and insists he has nothing to prove to anyone - except Liverpool boss Rafa Benitez.
"The one person I'd like to show is my old manager," said Kewell. "I didn't get a chance to show him a lot of what I could do and it would be great to show him what I was capable of doing.
"I didn't put my hand up to be injured. It's one of those things you have to go through in your life and it's a shame.
"I'm quite sure everyone will have their opinion (about whether I can come back) but I'm quite confident in my own ability.
"The body's good. Am I ready to play 90 minutes? Yeah.
"I think I can run with the best of them now. My match fitness is down because I haven't played for God knows how long, but in general fitness I'm very good.
"I'm just looking forward to going out there and playing football."
