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* The referee makes the sign of a screen with his fingers and goes to consult a screen on the edge of the pitch - the controversial VAR, video assistant refereeing system, will make its World Cup debut at Russia 2018. After experiments in different FIFA tournaments, Serie A in Italy and the German Bundesliga this season, the principle is now well known in most countries.

* Portuguese full-back Diogo Dalot became Manchester United's second major signing in two days the English giants announced on Wednesday (June 6) after securing a €22 million (£19 million) move from Porto.

* Andy Murray's hopes of being fit enough to play at Wimbledon have taken a fresh hit after he pulled out of his planned comeback next week in the Netherlands. The former world number one, who has not played a competitive match since he was knocked out of the Wimbledon quarter-finals last July due to a hip injury, underwent surgery in Australia in January after pulling out of the Australian Open.

* The US Soccer Federation on Wednesday appointed Earnie Stewart as the first general manager of the US Men's National Team, charged with helping to rebuild the side after their stunning failure to qualify for this year's World Cup.

* Rugby Union's governing body has pledged to clarify rules on player eligibility after an independent appeal body upheld a decision to punish three countries for breaching rules during European qualification for the 2019 Rugby World Cup. Belgium, Romania and Spain were fined and docked points after fielding players who were either ineligible or already signed up by another union.

* Russia said on Wednesday (June 6) it was ready to thwart any threats to the World Cup, which kicks off in Moscow next week, as a massive security effort ramps up.