Europe's top referees know they are under intense scrutiny when the Champions League starts next week.
.
Uefa wants its match official teams to get more offside decisions correct after high-profile errors in its marquee club competition last season.
.
In addition, mistakes by referees and assistants on Uefa duty could sway Fifa when it chooses referees for the World Cup in Brazil.
.
Fifa is expected to announce its selection in January.
.
It took 10 Europeans among 30 referees to the 2010 World Cup.
.
Uefa has provided 19 referees for Fifa to prepare, and Champions League group matches will be among their most important tests in coming months.
.
Netherlands referee Bjorn Kuipers tells The Associated Press about the pressure they face: "That is our life."
UCL is a competition for champions so we expect this all the time!