The experienced midfielder would welcome the arrival of Paul Pogba as he feels the Ligue 1 champions need new signings
The Parc des Princes side have already lured players such as Thiago Silva, Ezequiel Lavezzi, Edinson Cavani and Zlatan Ibrahimovic to Ligue 1 in recent years, but Motta feels they need further reinforcements if they are to make an impact in Europe.
PSG are being heavily linked with Juventus star Paul Pogba and Motta is confident that more competition for places in midfield will only benefit the French champions.
"Should PSG sign new players this summer? Yes, absolutely," Motta was quoted as saying by France Football.
"But we should not buy players at random. We need players who add something to the team.
"We need more competition for places, starting in midfield. I am saying this at the risk of losing my own place, but you know that there's always someone ready to take your place at a big club.
"We need players who can help us win in Europe. We need European glory if we are to be remembered by the people."
PSG were eliminated in the quarter-finals of the Champions League by Chelsea this term, after going out at the same stage against Barcelona last term.