"I am bidding farewell to international cricket as a player after the game," Lara said after his team's 99-run victory over Bangladesh in a Super Eights game here on Thursday.
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"We still have the World Cup to finish and we have a job to do on Saturday."
The dashing left-handed batsman holds twin batting records -- 400 not out against England in the Antigua Test in 2004 and 501 playing for Warwickshire against Durham in a first-class match.
Lara is also the only West Indies batsman to have completed 10,000 runs in one-day international cricket.
"We need a win ahead of the West Indies tour of England and it'll be a big boost ahead of the trip," said Lara, who has scored 11,953 runs in 131 Tests with 34 centuries.
Saturday's match will also be the last for England coach Duncan Fletcher who is stepping down after an eight-year stint with the national side.
Lara and England skipper Michael Vaughan are both under pressure to perform, with the West Indies captain having just