The EPL champions will investigate Liverpool's conduct over Gabriel Heinze's move away from Old Trafford.
Gabriel Heinze scored early in the first half as two-time champions Argentina started their2010 World Cup campaign in style with a 1-0 win over Nigeria in a Group B clash at the Elis Park stadium in Johannesburg on Saturday.
The Argentine defender joined Manchester United from Paris St Germain.
Lionel Messi lit up the World Cup on Saturday with a mesmerising individual performance but profligate Argentina still only beat Nigeria 1-0 with a goal from Gabriel Heinze in Group B.
Heinze returned recently to action for Manchester United after seven months, following a knee surgery.
A brilliant World Cup for Lionel Messi would be good for Argentina's chances of victory although it is preferable to rely on the team and not one man however great, according to defender Gabriel Heinze.
Argentina coach Diego Maradona was the mastermind behind the goal that gave them a 1-0 World Cup win over Nigeria, midfielder Juan Sebastian Veron said.
Klaas Jan Huntelaar struck twice to help Real Madrid register a 5-2 win at 10-man Athletic Bilbao on Saturday and cut Barcelona's lead at the top of the Primera Liga to three points.
Gabriel Heinze was brought down by Arsenal's Fredrik Ljungberg just before halftime and Thierry Henry then collided with the Argentine while he was still on the ground.
Olympique Marseille emerged from a nightmare start to their Ligue 1 title defence by beating Lorient 2-0 on Saturday.
If Argentina's line-up of soccer superstars had been in any doubt, they will not be now -- on the World Cup stage nothing grabs the cameras quite like Diego Maradona.
Lionel Messi answered the key question for Argentina with a display full of artistry and guile in Saturday's 1-0 win over Nigeria, showing even without scoring himself he can carry the team at this World Cup.
A veritable goldmine of soccer talent was on display at Ellis Park on Saturday but throughout Argentina's defeat of Nigeria a roly-poly, bearded bundle of arm-waving anxiety threatened to steal the show.
Fans dived in the sea at the Vieux Port as Olympique Marseille ended an 18-year wait for the French title when late goals by Mamadou Niang and Lucho Gonzalez secured a 3-1 home win over Stade Rennes on Wednesday.
Manchester United defender Gabriel Heinze, who has been out all season with a knee injury, was included in Argentina's World Cup squad.
Manchester United beat Reading 3-2 in an enthralling FA Cup fifth-round and earn a place in the quarter-finals.
Real Madrid beat Sevilla 3-1 at the Bernabeu to move six points clear at the top of the Primera Liga.
Argentina staved off a strong rally by Australia to win 4-2 and qualify for the semi-finals in the Confederations Cup.
Following Angel Di Maria's nightmare stint, Bikash Mohapatra/Rediff.com says the 'Theatre of Dreams' has never been a happy a hunting ground for players from the continent
Carlos Tevez was officially unveiled as a Boca Juniors player in a 6.5 million euros ($7.15 million) transfer from Juventus.
Brazil scored three superbly-taken goals, including a stunning Neymar effort, to beat feisty Austria 3-0 in sweltering conditions on Sunday and put the finishing touches to their impressive World Cup preparation.
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