AC Milan striker Bojan Krkic has lavished his former side Barcelona with praise labelling them "unstoppable".
The 22-year-old rose up through the ranks at the Spanish side's famed La Masia youth academy and will return to his boyhood club when the Rossoneri meet Barcelona in the Champions League round of 16.
And Bojan believes his current side face a difficult task in having to eliminate Barcelona in order to progress further as he regards them as "the best side in the world".