British Prime Minister Gordon Brown has announced an extra £5m ($8m) of transitional aid to Zimbabwe.
Mr Brown said the aid would go through aid agencies, not the government in which Mr Tsvangirai shares power with President Robert Mugabe.
Zimbabwe says it needs $8bn (£4.9bn) to revive the economy but pledges during Mr Tsvangirai's tour of Europe and the US have fallen far short of that sum.
Many donors are still wary of sending money which could be used by Mr Mugabe and his allies.
Some £4m ($6.5m) of the new money would be devoted to food aid and the rest to buying text books for Zimbabwean schools, Mr Brown said.
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