Europe's leading coaches are in favor of the experiment with two extra linesmen behind the goals and prefer it to the use of goal-line technology, UEFA said on Thursday.
FIFA ended a four-day visit to inspect Spain and Portugal's 2018 or 2022 World Cup bid by praising the countries' capacity to co-ordinate effectively in hosting a joint event.
Retaliation fouls may occur from a build-up of frustration over time, but they often occur immediately after contact where a player perceives such contact to be a foul.
World Cup final referee Howard Webb has seen several re-runs of the game since returning from South Africa but said the only thing he would change is the color of the card he showed to Nigel de Jong.
Aerospace engineers at the California Institute of Technology normally test cars and telescopes for aerodynamic differences in their high-tech wind tunnel.