A QUESTION OF A TKOF CLRNC ISSUED OR NOT AND WAKE TURB AT A FOREIGN ARPT.

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AT MMX THE CREW WAS GIVEN A CLRNC TO TAXI TO RWY 5L. WE WERE #1 FOR TKOF. UPON ARRIVING AT THE END OF RWY 5L; I CALLED THE TWR AND ADVISED READY FOR TKOF. THE MMX TWR CTLR ISSUED A CLRNC FOR TKOF ON RWY 5L. THE CREW ACCOMPLISHED THE BEFORE TKOF CHKLIST AND BEGAN THE TKOF ROLL. AT APPROX 10 KTS BELOW V1 THE TWR CTLR CAUTIONED US ABOUT WAKE TURB FROM A WDB THAT DEPARTED PRIOR TO US ON THE PARALLEL RWY 5R. AT ROTATION THE CTLR CONTINUED HIS COMMENTS AND SAID '...I DID NOT CLR YOU FOR TKOF. BE CAREFUL IN THE FUTURE AND CONTACT DEP.' THE WDB ACFT THAT DEPARTED BEFORE US WAS APPROX 6 MI AHEAD ACCORDING TO THE TCASII. NO EVASIVE ACTION WAS NEEDED OR TAKEN. THE CREW OF 3 ALL UNDERSTOOD THAT WE WERE CLRED FOR TKOF. IF THERE IS EVER ANY DOUBT FROM ANY OF THE CREW I ALWAYS CONFIRM A CLRNC. ENRTE; NONE OF THE CREW COULD RECALL VERBATIM WHAT THE CTLR SAID PRIOR TO BEGINNING THE TKOF ROLL. EITHER THE CREW MISUNDERSTOOD THE CLRNC OR THE CTLR ISSUED A TKOF CLRNC BY MISTAKE. THIS WAS THE LAST NIGHT OF A 6 NIGHT TRIP SEQUENCE OF ALL NIGHT BACK SIDE OF THE CLOCK CARGO TRIPS. FATIGUE COULD HAVE PLAYED A FACTOR. THE SPANISH CTLR SEEMED TO BE ABLE TO SPEAK ENGLISH WELL ENOUGH TO UNDERSTAND. WITHOUT LISTENING TO THE CTL TWR TAPES TO CONFIRM WHAT WAS SAID; THE WHOLE EVENT WILL REMAIN A MYSTERY.