The European Central Bank (ECB) Vice President Vitor Constancio said in Vilnius, Lithuania, on Friday that it will be difficult to reach a deal between Greece and its lenders if Greeks vote "No".

"That of course would imply that the situation also in Greece becomes more difficult because the situation of banks will become weaker, if an agreement is not possible in short period of time," he said.

But Constancio added that the central bank was ready to deal with any situation.