PSG wary of Costa's 'games'

London - Paris Saint-Germain coach Laurent Blanc on Tuesday told his players to be wary of underhand tactics from Chelsea striker Diego Costa ahead of Wednesday's Champions League last 16 return leg.

Having claimed a 1-1 draw in the first leg in Paris, Jose Mourinho's Chelsea hold the upper hand in the tie as they attempt to reach the quarter-finals for the fourth time in five seasons.

PSG must score to stand any chance of progressing, but Blanc is also concerned about the bruising Costa, who has attracted as much attention for his goals -- 17 since joining Chelsea from Atletico Madrid last year -- as for his rough-house tactics.