The Gunners spent £27million on the 19-year-old last summer but was sent straight back to Saint-Etienne on a season-long loan.
However, Saliba is set to return to the Emirates this summer and although Campbell claims the centre-back ‘has to’ go straight into the Arsenal team, the former Gunner has encouraged Mikel Arteta to sign another defender to pair up alongside the French teenager.
“We made a very astute signing last year which many gave the club stick for: Saliba.
“At least we’ve got a centre half, a big, strong, quick, centre half who is going to go straight into that side. He has to.
“Do we need another one? Yes we probably do. Will we get one? Who knows?
“If we can get Saliba in and bed him in nicely then at least the defence is a lot younger and is a lot stronger.”
The Gunners have already been linked with a few defenders this summer including Manchester United’s Chris Smalling, Bayern Munich’s Jerome Boateng, RB Leipzig’s Dayot Upamecano and Barcelona’s Samuel Umtiti.
It remains to be seen how much funds will be handed over to Arteta to spend and if the club go for any of the abovementioned names this summer.