Arsenal paid the Brazilian club a £4m loan fee for Mari, and have the option to make the move permanent for an additional £8m in the summer.
And while Leno admitted he doesn’t know either player he hopes both of them can settle in quickly.
“I don’t know the players, but I think they have the quality to join Arsenal,” Leno said.
“With them we have more options.
“Mari is left footed, so as a centre-back that is a good option.
“Hopefully they adapt very quickly to Arsenal.”
source: express.co.uk