Alex has been ruled out of Brazil's friendly international matches against Iran on Thursday and Ukraine on Monday.
The central defender underwent medical assessment on a thigh muscle injury sustained in the closing moments of Sunday's win over Arsenal, after he had scored Chelsea's second goal.
It is estimated he will be out for three weeks.
Ramires has joined up with the Brazil squad for the two games, the first of which takes place in Abu Dhabi, the second at Derby County's Pride Park.
Chelsea Football Club is aware of the problem Yossi Benayoun has had with his achilles, as reported by the Israel national federation today.
It has been managed in close consultation with his national team. Chelsea's medical staff will assess Yossi further on his return to our training ground at the weekend.
Carlo Ancelotti will be signing copies of his new book The Beautiful Games of an Ordinary Genius at the Megastore today (Wednesday).
The manager will be there between 4pm and 6pm. Anyone planning on coming along is advised to arrive early to avoid disappointment.
Due to time constraints, only copies of the book will be signed and we cannot guarantee everybody will be seen.
