A Super League record crowd for a regular season match saw his Dragons side beat Wigan on Saturday, a figure only just shy of a typical daily attendance at the Magic events.
The latest edition of Magic Weekend, now in its 13th year, will take place at Anfield next weekend, the fifth different venue for the showpiece event.
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And already there are debates over where it could head in the future, with ticket sales believed to be disappointing for the Liverpool dates.
McNamara said: “There’s a push from people to play Magic Weekend here in Barcelona.
“I couldn’t disagree with that, but the groundsman might have an issue with it!
“It’s the best surface we’ve ever played on.
“I’m not sure whether we have to put a team in every city that we visit, we don’t have to do that.
“But to showcase the sport in a place like Barcelona is huge.
“We all know how good the game is internally in our own rugby league circle, but we need to show it to other people and to expose them to it.”
Magic Weekend has previously been played at the Millennium Stadium in Cardiff, Murrayfield in Edinburgh, Etihad Stadium in Manchester and St James’ Park in Newcastle.