There's no point in keeping him on the pitch if he's running out of steam. It'll be planned by all the fitness teams and physios. They'll know exactly what his limit and his capacity is, and when he reaches it, they'll take him off the pitchIf he stayed on and was out of steam and out of energy, that's when he's more susceptible to getting booked or sent off, or getting injured, and that's something we absolutely don't want.