ATHENS (Reuters) - Greece's former finance minister Euclid Tsakalotos was "most likely" to be reappointed, a source in the leftist Syriza told Reuters on Monday. Tsakalotos led negotiations for Greece on the terms of a bailout worth up to 86 billion euros in August. Syriza won parliamentary elections in Greece on Sunday. (Reporting By Renee Maltezou; writing by Michele Kambas; editing by John Stonestreet)