French back-rower Sekou Makalu scored twice as Stade Français returned to the top of the French top 14 with a 25-12 win over Pau on Saturday.
The Parisians had fallen to second place earlier in the day after Toulouse's 33-6 thrashing of Castres, but Stade Français have regained top spot on the back of a record head-to-head record with 22 wins. Ta.
McCullough, who was left out of Les Bleus' Six Nations squad due to his early-season form, came through either side of the break at the rainy Stade Jean Bouin.
SURPRISE PACKAGE Pau sent a second team to the capital with former New Zealand international lock Sam Whitelock in the final sixth of the play-offs.
Toulouse's victory was good news for France national team coach Fabien Galthie, who had been struggling.
Rox Thibault Flamand and Emmanuel Mehou missed the start of the Six Nations with injury but were intact until joining Galthie's squad on Sunday.
“I felt good,” Flament told Canal.
“It's been a lot of fun. It's been a while since I've been away from the field, so it's good to be back,” he added, having been sidelined since early December.
In other matches, Montpellier defeated Oyonnax, who are based near the Swiss border, 39-35, giving them a 10-point lead over Oyonnax, who are at the bottom of the table.
Former France Under-20 flanker Leni Nouci scored a hat-trick for the visitors in 16 minutes.
Late on Saturday, Siya Kolisi's struggling Racing 92 side travel to Bordeaux Begles looking to avoid a fifth straight league defeat for the first time since 2012.
Clermont travel to La Rochelle on Sunday and have appointed Alivereti Laka as captain after the Fijian-born France international winger was subjected to abuse on social media this week.
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