LONDON, June 11 (Reuters) -Indonesia's Pertamina was seeking crude supplies in what could provide a small boost to Nigerian exports that have been flagging recently.

* Pertamina issued a tender for August-arriving crude due to close later this week.

* Nigerian sales have been muted as tendering has been slow, key buyer India has eased up on purchases and European refiners mostly take on U.S. alternatives.

* Stiff competition has meant the scaling down of European refinery maintenance season has barely given a boost to Nigerian exports there.

* About 10 cargoes of Angola's July-loading cargoes remain unsold, traders said.

Reporting by Noah Browning
Editing by David Goodman

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