With the opening of the Chinese Super League's winter transfer window drawing near, there have been numerous rumors about player transfers among various teams, including the traditional powerhouse of the Chinese Super League - Beijing Guoan. Since the departure of Mamichevich and Desosa, Guoan's midfield has been lacking a versatile defensive midfielder. Last season's addition to Guoan, Guga, although playing as a defensive midfielder, is actually a No. 6 player who primarily serves as a link on the field and is not a true "beast" type player. Therefore, the focus of Guoan's recruitment during the winter transfer window is a good foreign defensive midfielder. Recently, there were rumors that Carvalho, the current Portuguese international playing for La Liga team Real Betis, was expected to join Guoan. However, this 32-year-old Portuguese midfielder suffered a major Achilles tendon rupture last season and almost didn't play any games, making him an unlikely choice for Guoan. According to the latest news, Guoan's top choice for a new defensive midfielder is former Brazilian international Rafinha. The 31-year-old Rafinha comes from the youth training system of La Liga giants Barcelona and joined the first team in 2011. This Brazilian midfielder possesses excellent dribbling and breakthrough abilities, performs well defensively, and has a high football IQ. From the 2011 to 2020 seasons, he was a key rotational player in Barcelona's midfield, representing the team in 56 rounds of La Liga matches, scoring 8 goals, with an overall commendable performance. Afterwards, he was successively loaned to Celta de Vigo in La Liga and Inter Milan in Serie A.…