But supporters of the idea insist it will add extra spice to the competition, with the Dragons likely to be fired up at being thought of easier opponents.
Leeds, the defending champions, finished the regular season at the top of the table, and qualified for the semi-final courtesy of a crushing 44-8 win over Hull KR in the opening round of the play-offs.
The Dragons squeezed into the play-offs courtesy of a final-day victory over St Helens, but have hit form in impressive fashion with away victories over Wakefield and Huddersfield taking them to within 80 minutes of the Grand Final.
"It's not really a surprise," said Catalans chief executive Christophe Levy.
"It is a huge task. We have never won here but we had never won at St Helens up to two weeks ago."
Catalans coach Kevin Walters added: "I think Leeds made the logical decision. If there had been no ClubCall, we were the lowest-ranked winner, so the two would have played each other.
"Headingley hasn't been a happy hunting ground for the Dragons but that's to be expected, they've been champions for the last two years.
"There's not a tougher away game to go to, particularly with the pressure involved of the semi-finals, but we're happy to be invited to the game."
The two teams have met three times this season, with the Dragons winning 32-30 at home in June. But Leeds won 36-16 in France and 42-14 at the Murrayfield weekend earlier in the year.
Wigan have also been in impressive form, winning 10 of their last 13 matches, including play-off victories over Castleford and Hull KR.
The Warriors, who are hoping to reach their first Grand Final since 2003, will face St Helens at Knowsley Road on Saturday.
Wigan coach Brian Noble admitted he would like the rules to be tweaked to allow the top club the option of choosing any of the remaining teams.
And St Helens chairman Eamon McManus admits he still has reservations about the system.
"I've been a great supporter of results dictating fixtures," he said.
"But I'm aware of the extra publicity that it has produced for the game and I will reserve my judgement for the end of the season.
"I wasn't perturbed at not having to choose. All four teams are pretty near to each other in terms of standard and fitness and both games are very difficult to call.
"I would have liked to have seen a Wigan-Saints final. I may be biased but I think that is the biggest game in rugby league."
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