The collapse occurred as visiting fans celebrated Fode Ballo-Toure scoring Lille's opening goal in the 15th minute.
French emergency services later reported 18 people had been hurt, three seriously.
Several fell about 1.5 metres and were crushed by other fans who dropped on top of them.
He told the LCI channel that the s tadium was being refurbished, but insisted the painting and roofing work had nothing to do with the collapse. He added there was a security inspection of the venue before the game.
All the people injured after a barrier collapsed during Lyon's match at Amiens on Saturday have been released from hospital.
Director general Marc Ingla tweeted: "We are thinking first and foremost of our supporters".
"I wanted to say how risky it can be when supporters charge en masse in a matter of seconds towards a barrier and that they are also putting themselves in danger", he said.
The LFP expresses its solidarity with the injured and their families. "We hope that the French league identifies those responsible".
"Professional football demands a certain number of organisational requirements, and in this context, these statements seem inappropriate and irresponsible". The festivities came to an abrupt halt, however, when the barrier broke, causing a torrent of fans to stream over the edge onto the back of the field.
An update from Lille's official Twitter account on Sunday said: "Six people are still hospitalised this Sunday morning, but the news is reassuring".