London's world cruiserweight champion David Haye has held talks with world heavyweight champion Wladimir Klitschko over a possible title fight this year.
The pair went for a meal on Thursday night to talk about a potential bout.
The Ukrainian told BBC London 94.9: "He is looking forward to switching to heavyweight, but it's not an easy step.
"There are exceptions like [Evander] Holyfield, who was a very successful heavyweight, so we'll see what David Haye is going to do."
Haye holds the WBC, WBA and WBO cruiserweight belts after beating Enzo Maccarinelli at the O2 Arena last month.
But he plans to vacate his belts in the next few months as he prepares to step up to the heavyweight division, in which he has fought only once before.
Klitschko, the IBF and WBO heavyweight champion, wants the fight to be in London.
He added: "I'm looking forward to fighting in London again, because London, like Great Britain in general, has such a great boxing community, it's amazing."
From BBC sport
The pair went for a meal on Thursday night to talk about a potential bout.
The Ukrainian told BBC London 94.9: "He is looking forward to switching to heavyweight, but it's not an easy step.
"There are exceptions like [Evander] Holyfield, who was a very successful heavyweight, so we'll see what David Haye is going to do."
Haye holds the WBC, WBA and WBO cruiserweight belts after beating Enzo Maccarinelli at the O2 Arena last month.
But he plans to vacate his belts in the next few months as he prepares to step up to the heavyweight division, in which he has fought only once before.
Klitschko, the IBF and WBO heavyweight champion, wants the fight to be in London.
He added: "I'm looking forward to fighting in London again, because London, like Great Britain in general, has such a great boxing community, it's amazing."
From BBC sport