Bolton officials were stunned to find their entire trip itinerary - including their flight number and arrival time, plus the name of their hotel and training schedule - pasted on Atletico's official website.

The British Embassy in Madrid are looking into the incident with the visitors - who will defend a 1-0 lead following their famous win at the Reebok Stadium last week - fearing their programme could be deliberately disrupted.

Megson said: "This is very strange behaviour for a club of Atletico's size and status. It obviously raises serious security concerns regarding Bolton Wanderers players and staff ahead of this game."

The incident has hardly eased tensions ahead of what is set to be another stormy encounter.

Sergio Aguero was dismissed in the first leg for spitting and striker Mista appeared fortunate to avoid punishment for the same offence.