The squad have been getting ready for September's showpiece event, and went up against the RFU Championship side at Cranleigh School in Surrey in order to do so.
London Scottish head coach Pete Richards tweeted : 'What a great experience @LSFCOfficial had today training against @officialTongaRU. Thank you for your hospitality.'
The training session came after the news that the haka of all the Pacific Island sides, including New Zealand, will be given its full voice at the World Cup.
