France’s captain suffered the fracture late in the Group D clash with Austria in Duesseldorf on Monday, after jumping for a header and colliding with the shoulder of defender Kevin Danso.
Mbappe was taken to hospital but the French federation said he did not require immediate surgery and will get a mask, prompting social media banter with France rugby skipper Antoine Dupont.
Dupont had surgery after fracturing a cheekbone in the early stages of last year’s Rugby World Cup in France -- a more serious injury than Mbappe’s nasal septum fracture -- but the scrumhalf was back training within a fortnight and returned to play in the World Cup quarter-final.
He had a specially fitted mask made but in the end wore only a scrum cap in his return match.
"Any ideas for a mask?" Mbappe tweeted on Tuesday.
"Private message me for a promo code. I have some solutions. Above all, good luck," Dupont replied.
Mbappe’s obvious replacement would be 37-year-old Olivier Giroud. He suffered an adductor injury in the Austria match, French media reported, but should resume training on Wednesday.
