Toulon president apologises to Leicester over Martin Castrogiovanni rant

• Mourad Boudjellal may sanction prop over tirade• European Professional Club rugby also investigating incident• Castrogiovanni lashes out at CockerillThe Toulon president, Mourad Boudjellal, has written to Leicester to apologise for the outburst of Martin Castrogiovanni after Sunday’s European Champions Cup defeat at Welford Road and warned the Italy prop that the club may discipline him irrespective of whether European Professional Club Rugby decides to hit him with a misconduct charge.Castrogiovanni entered the media room after the match and launched into an expletive-laced attack on Leices…