The Gunners signed the former Manchester City centre-back from Brazilian club Flamengo in January and he impressed at Portsmouth in the FA Cup on Monday night.
He didn’t make a single top-flight appearance for City, but now the 26-year-old gets the chances to impress in front of the Emirates faithful after being named in the starting XI for the visit of West Ham.
Elsewhere, Eddie Nketiah continues up front instead of Alexandre Lacazette, while Dani Ceballos retains his place in the Arsenal midfielder.
Arsenal are looking to win three-consecutive matches in the Premier League for the first time since August 2019.
For the visitors, they’re looking for two-straight victories since the same month, and they’ll hope Jarrod Bowen can continue his fast start up front.
Confirmed team news
Arsenal: Leno, Sokratis, Luiz, Mari, Saka, Ceballos, Xhaka, Pepe, Ozil, Aubameyang, Nketiah.
Subs: Martinez, Bellerin, Lacazette, Nelson, Willock, Guendouzi, Martinelli.
West Ham: Fabianski, Ngakia, Ogbonna, Diop, Cresswell, Noble, Rice, Fornals, Antonio, Haller, Bowen.
Subs: Randolph, Balbuena, Zabaleta, Anderson, Lanzini, Snodgrass, Soucek.
Mikel Arteta has handed a Premier League debut to Arsenal new boy Pablo Mari for the Premier League clash with West Ham on Saturday.