(CNN) -- Brazil international Alex has become the latest player to sign a new contract with Chelsea as the English Premier League club seek to shore up their squad in the wake of their transfer ban.
Chelsea defender Alex is hoping to win back his Brazil place when he returns to full fitness.
The defender agreed a new four-year deal on Tuesday, following Ivory Coast forward Salomon Kalou's commitment to a three-year extension of his stay at Stamford Bridge the day before.
Captain John Terry, England fullback Ashley Cole, Ivory Coast striker Didier Drogba and young defender Michael Mancienne have also signed long-term deals since the summer.
The London club will not be able to sign any players for the next two transfer windows if an appeal against world ruling body FIFA's punishment over the illegal signing of teenager Gael Kakuta from Lens is not successful.
Alex has yet to feature for the Premier League leaders this season following a groin operation, but is back in training and wants to win his international place back ahead of the World Cup next June.
"I am very happy to start again to train and feel no pain, and to sign for four more years," the 27-year-old, who signed from Dutch club PSV Eindhoven in 2007, told Chelsea's official Web site.
"It was easy to decide to sign, and now I hope to get back to playing well.
"My condition now is so-so. I think in two more weeks I am 100% and can play without a problem. I hope now to start to play in the Chelsea games and play very well.
"[Brazil coach} Dunga has spoken to me and said, 'I am happy to see you playing again. I hope you start to play well and I will call you to play in the national team again'
"To go back into the national team is important to me. Also the Chelsea team started very well this season, is at the top, and this season to win the Premier League is important to me. Now I want to play."
Meanwhile, Liverpool manager Rafael Benitez has escaped with a warning after being found guilty of making an "offensive" gesture to a referee by the English Football Association.
The Spaniard was charged after Liverpool's defeat by Tottenham on August 16 for taking his spectacles out of his pocket while answering a question about the performance of the match referee.
Benitez, who was cleared of two other charges relating to the same match, was only warned about his future conduct due to his "previous exemplary disciplinary record over 23 years as a coach and manager at the highest level of the sport," the FA said.