The attacking-minded player, who began his career with Osasuna, joins Athletic Bilbao after 72 appearances in Serie A in which he scored eight goals and provided seven assists.
"It's not what we wanted but for now those players aren't available," Farias said. "I'm confident we can compete with the players we have".
Mainz failed to put up any resistance while Union relentlessly tripled their lead after Marvin Friedrich headed home Christopher Trimmel's free-kick in the 63rd minute for 3-0.
River Plate's Armani and his Boca Juniors counterpart Andrada were joined by defenders Lucas Martinez Quarta (River Plate), Gonzalo Montiel (River Plate) and midfielder Eduardo Salvio (Boca Juniors), the Argentinian Football Association (AFA) said.
In the match between Jiangsu Suning and Beijing BG Development, Zhai Qingwei's long-range shot in the 29th minute helped Jiangsu defeat Beijing 1-0.
"If you impose yourself from the very beginning on the court, which I have in those first three matches here, then it makes it hard for them to really believe that they can come back and make a turnaround in the match," said the 2016 champion, who is seeking for an 18th Grand Slam title at Roland Garros.
Having overcome last season's top-ranked side Beijing on Thursday, Jiangsu never looked threatened from the tip-off on Monday. They out-rebounded Tianjin 43-25 to score 26 points on second chances.
The signings of Callum Hudson-Odoi (Chelsea) Sergino Dest (Ajax) failed due to the Blues demand to implement a buying-obligation and Barcelona surpassing Bayern's 20 million offer.
Taki crossed the line in 3:35.00 ahead of Abel Kipsang (3:35.43).
Colombia will face Venezuela in Barranquilla on Friday and Chile in Santiago four days later.
Wu Tongtong, who scored a game-high 30 points, helped Shanxi seal the win, while Fang Min pocketed a team-high 17 points for Henan. Enditem