The Welsh Rugby Union is to take action against four more Welsh rugby clubs - over the sale of tickets to internationals on an online auction.
Wales tickets have been put up for sale on the internet
They are Loughor, Pontllanfraith, Narberth and Abercrave.
Rugby authorities in New Zealand and Australia are also being asked how some of their allocations ended up on sale.
The WRU is to take action against seven other clubs after it claimed international tickets issued to them were put on sale on the internet.
Boses said they will investigate each case - Aberavon, Blaenavon, Caldicot, Cilfynydd, Cwmgwrach, Gorseinon and Resolven - before deciding on further action, but it could include withdrawing all future tickets.
The WRU has been campaigning against what it calls ticket touting.
One pair of tickets was for sale for £2,000 on one website before the Grand Slam decider against Ireland in March.
In an initial statement which referred to the first seven clubs, the WRU said they had "fallen foul of its tough new ticket policy".
Tickets for Wales games can demand high resale prices
The WRU went on: "This practice clearly contravenes the regulations outlined in the WRU ticket policy which was issued to all clubs, debenture holders, affiliated bodies and published in the media and on the WRU website."
The union said it wanted to "ensure that Welsh rugby international tickets remain in the hands of true rugby supporters and not sold to the highest bidder".
All the tickets will be withdrawn from circulation, which the WRU said would make them "null and void".
The WRU said: "This means that people should not consider buying tickets up for sale in this way because they are highly likely to be refused entry to the Millennium Stadium or ejected from their seat."
The union said it could refuse future tickets to organisations or individuals breaking the rules.
'Line in the sand'
Gorseinon chairman Mr Jenkins said: "As far as Gorseinon is concerned, we are now carrying out a full investigation as to how these tickets came to be on sale.
"The person that allegedly put them on (sale) wasn't the person who received the tickets - it was somebody belonging to them."