The incident took place 34 seconds into his side’s 1-0 Ligue 2 victory over Guingamp when the Honduras international clashed with defender Donatien Gomis.

He was removed from the action on a stretcher after eight minutes of on-pitch treatment and later placed into an induced coma.

The 28-year-old’s club issued an update on Monday (AEDT), reading: “It is still impossible to comment on Alberth’s vital and functional prognosis” and called for “restraint” during the troubling time.

The statement added: “Alberth Elis suffered a significant head impact last night at the very start of the match on Matchday 26 in Ligue 2.

“Supported by the medical team, he was quickly transferred to the CHU Pellegrin [hospital] in Bordeaux where a surgical procedure was carried out overnight.

“Alberth Elis suffered a head trauma and he was placed the player in a protective artificial coma.

“We will follow his health condition in the hospital in the coming days. At this moment, it remains impossible to comment on Alberth’s vital and functional prognosis.

“The club therefore expects not to be able to communicate any decisive information for a few days and will not make any further comments on Alberth’s health.

“We call for restraint regarding the dissemination of medical information, out of respect for him, his family and those close to him, at a time when nothing else is more important. A psychological unit will quickly be set up to support club employees in these difficult times.

“The club and all of its employees extend their full support to his family and loved ones during this terrible ordeal.”

Bordeaux president Gerard Lopez said: “We warmly thank all those who have shown their support for Alberth and those close to him, in particular the clubs across France.

“Your words warm our hearts and are a great strength in the fight that Alberth is waging.”

Bordeaux head coach Albert Riera paid tribute to Elis in his post-match press conference, saying: “My first words are for Alberth. We spoke with the doc and we can’t say anything.

“He is in the hospital and there is nothing we can say. The victory is for him.”

Elis’ sinternational team-mate Luis Palma took off his shirt to reveal a Fuerzas Elis (Strength for Elis) message on his vest after scoring for Celtic at Motherwell on Monday (AEDT).