South Africa's Chiliboy Ralepelle and Bjorn Basson will play no further part in the Springboks' tour of Britain and Ireland after the pair failed doping tests.

The duo both returned positive test samples for the banned stimulant methylhexaneamine following South Africa's 23-21 win over Ireland in Dublin on November 6.

Six Nations Rugby Ltd - who administer the November internationals - informed the South African Rugby Union of the positive tests late on Sunday.

As a result the pair are provisionally suspended from all rugby, including this Saturday's match against Scotland at Murrayfield and the November 27 encounter against England, and will return to South Africa on Monday.

Basson injured an ankle playing on the wing in Saturday's 29-25 win over Wales in Cardiff - a match where front row Ralepelle came off the bench - and was due to return anyway.

The players were randomly drawn for testing by anti-doping officials following the Test at Lansdowne Road. Both Basson and Ralepelle have the right to request that their 'B' sample be tested.

A SARU statement said the pair "returned an adverse analytical finding for methylhexaneamine, a 'non-specified stimulant' on the prohibited substances list of the World Anti-Doping Agency (WADA). It is scheduled to be re-classified as a 'specified stimulant' from January 1, 2011."

'Non-specified' means there are no concessions in the WADA code for unintended use.

Methylhexaneamine, a stimulant that appears in some nasal decongestants, was also the substance that led to Nigeria's Osayemi Oludamola being stripped of her 100 metres gold medal at the Delhi Commonwealth Games last month.

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