MASCHERANO WHERE?

AfterArgentinian skillful international midfielder Javier Mascherano was broken down with Brazil team Corinthians, his team River Plate is searching for a new buyer for himself.
So, Argentinian International player's manager offered Mascherano to 3 teams includes Serie A team Fiorentina and La Liga teams Real Madrid and Deportivo.
Mascherano's price tag is only 10 million euros due to River Plate's poor economic situations.
We don't understand Argentinian team that doesn't sell former miedfield playmaker Marcello Gallardo, why are they obstinate about selling Mascherano for 10 million euros?.