Chelsea legend John Terry has offered a fascinating insight into Jose Mourinho's tactics when they were at the club.

Mourinho, who won the Premier League on several occasions with the Blues during two stints, is now in charge at AS Roma in Italy.

Terry, who was commentating for the World Cup, spoke about Mourinho's pragmatic nature and how he used any loophole in the rules in favor of his team.

“Just to win. Didn't care about anything else, he did anything to get an edge," Terry explained on beIN Sports.

“I remember, the rule was, if we were 1-0 up and the ball got delivered into the box…if two defenders went up together and both went down on the floor after, you didn't have to go off the field of play.

“So last 10 or 15 minutes, he would sit me and Gary Chaill down and go: 'when the ball comes in the box, make sure you both go down - bump into each other and both go down because you can't both go off.

“We'd never heard of that rule ever. So ball comes over in the last 10 minutes, head it away, Gaz goes down and I think 'I better go down'. So I dropped to the floor and the ref said 'you two off the pitch'. I said 'no that's not the rule, ask the linesman'."

Terry added: “Mourinho was so far ahead with those little bits and you're talking small margins and the best managers find those little margins. Incredible."