Fiji, hot on the heels of an emphatic victory over Division one leaders Pontypool, will be watched by over 30,000 fans this weekend and the Canada match should draw similar crowds.
"In the three days since Wales defeated Romania at Wrexham we have moved over 4,000 tickets for Fiji's visit to Cardiff," said a WRU ticket office spokesman.
"So we are hoping that a win over Fiji will mean an even more significant rise for the following weekend against Canada."
There are an extremely limited amount of tickets still available to the general public for the final match of the series against the All Blacks.
"The response to the New Zealand match has been amazing, we have found at least 5,000 fans will be making the trip from the Southern Hemisphere and it will inevitably sell-out," he added.
"New Zealand is traditionally the biggest draw, but it's possible a win over the impressive Fijians this weekend could send Canada tickets soaring into the same category."
Fans wishing to buy tickets should click here Millennium Stadium ticket office at 98 St Mary Street or call the ticket hotline number on 08705 582 582. Tickets are priced at Â£20, Â£15, Â£10 and Â£5 concession for the Fiji (November 9th) and Canada (November 16th) games and Â£38 each for New Zealand (November 23rd).