"My heart is with Liverpool, but obviously I have to consider everything I've been told and do what's right.
"The decision to sell me has not entirely come as a shock to me, but deciding whether to go or not is very hard for me.
"I'll be back in England later this week and that's when I'll decide whether to go to Bolton. They're the only club which have shown any interest.
"It could still go either way, but now I've got to think carefully about what's best for my future."
Hamann is currently still in Germany, but will hold talks with Sam Allardyce in midweek.
He was given permission to leave the club by manager Rafa Benitez last week, as the Reds feel they have strength in depth in midfield and need to allocate resources to improve other areas of the team.
Liverpool spent the weekend stepping up efforts to sign Daniel Alves, but Seville continue to hold firm on a £12m valuation.