No-one from Jaw prison where Mr Rajab is being held was available for comment.
BBC: Bahrain activist Nabeel Rajab 'denied medical treatment'
Mr Khawaja's decision follows the release on bail of another detained Bahraini activist, Nabeel Rajab.
Mr Rajab was arrested on 5 May at Manama airport on his return from the Lebanese capital, Beirut.
There, according to Rajab, he was beaten, blindfolded and interrogated about an armed suspect they believed he knew.
Mr Rajab is the president of the Bahrain Centre for Human Rights (BCHR) and has over 200, 000 followers on Twitter.
Rajab's lawyer told CNN he would file an appeal of the sentence after the end of Ramadan holiday next week.
Mrs Rajab said this happened after her husband called her on Tuesday, telling her he had seen young prisoners being beaten.
Mrs Rajab said she had been told by a relative of another prisoner that he had been moved from his cell.
This follows the complaint made by the Zambian champions that Rajab was ineligible for the first-leg encounter played in Dar-es-Salaam two weeks ago.
His wife Sumaya Rajab said she was "very worried" about him.
On March 20, about 25 people in about a dozen cars pulled up to Rajab's house and took him to the offices of the Interior Ministry's investigative department.
According to Ahmed Rajab, editor of the magazine Africa Analysis which has published reports on Mr Mohammed, the FBI says that during a search of Mr Mohammed's home, investigators found computers that contained evidence linking him to the al-Qaeda network.
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