Arsenal made Trossard their first January signing, securing his services in a £27m deal from Premier League rival Brighton.
Mikel Arteta’s side then bolstered their defensive options by signing Jakub Kiwior from Spezia.
Trossard made his Arsenal debut as a substitute in Sunday’s Premier League 3-2 victory over Manchester United, while Kiwior watched on from the stands.
Scholes, however, believes Trossard will be a ‘great signing’ for Arsenal but says the Premier League leaders should be looking to sign more players.
“When you’re going for titles, you need strong squads, you need players who can come in and replace players,” Scholes told Premier League Productions.
“When Leandro Trossard came on for Gabriel Martinelli, I did not think it weakened Arsenal, it really did not.
“So I think Trossard is a great signing. Two or three more would really boost this team to go on and win the Premier League.”