The Olympique de Marseille star believes the duo's heavy investment has created a huge amount of expectation, and revealed he is "pumped" to win titles next season
PSG are favourites to complete the capture of Edinson Cavani from Napoli having invested heavily in their squad last season, while newly promoted Monaco have splashed the cash to land the likes of Radamel Falcao, James Rodriguez and Joao Moutinho this summer.
Valbuena, who helped Marseille clinch second spot behind PSG in Ligue 1 last season, feels the huge investment at each club will lead to a huge amount of expectation heading into the new season.
"The pressure will be mainly on their shoulders [PSG and Monaco]," he told La Provence. "Plenty is expected of them in relation to their spending and their recruitment."
Marseille have likewise invested in the market so far this summer, securing the signing of Dimitri Payet from Lille and agreeing a deal for Le Havre youngster Benjamin Mendy, and Valbuena is confident his side can compete for trophies next season.
"I'm still pumped," the 28-year-old added. "This season is super important. I want to be better, to be more decisive, to win titles, because it is magic to achieve things with l'OM."