Arsenal attacker Gabriel Martinelli could be facing another long period on the sidelines, having suffered a potentially serious ankle injury on Saturday.

The Brazilian was named in the starting XI for the FA Cup clash with Newcastle United but appeared to turn his ankle as he warmed up for the contest.

According to Sky Sports News, Martinelli will undergo a scan over the next 24 hours to determine the seriousness of the damage, but Gunners boss Mikel Arteta fears that it will be "bad news".

"I am gutted. I was in my office before the game and one of the medical staff came in and said he twisted his ankle. He was in tears and in a lot of pain. I'd imagine it's going to be bad news but we'll wait to see what's going on," said Arteta after his side's 2-0 win over the Magpies.

Martinelli has only just returned from a long period on the sidelines due to a knee injury, featuring in three of his team's last four Premier League matches.

The 19-year-old has scored 10 times and registered five assists in 30 appearances for Arsenal in all competitions since arriving from Brazilian football in the summer of 2019.