The Holland international, 32 this summer, has a year to run on his Anfield contract, but seems destined to leave after a season in which he found first-team starts limited.
One club he has ruled out, however, are former side Feyenoord who would not be able to afford his wages.
"I have had several conversations with Feyenoord but we were unable to agree," he added. "I did not want on my conscience that Feyenoord would have financial problems because of my salary.
"There were too many doubts on both sides. I've thought about it, but it is not the time to return."