Pakistan fast bowler Mohammad Amir has been released from prison after serving half of his six-month sentence for his role in the spot-fixing scandal.

The 19-year-old is now expected to remain in London for a few weeks to compile his appeal to the Court of Arbitration for Sport (CAS) against his ICC-imposed five-year ban from cricket.

Amir was banned from the sport along with team-mates Mohammad Asif, who got seven years and former Pakistan captain Salman Butt, who received a 10-year suspension.

The trio were also all jailed after being found guilty of conspiracy to accept corrupt payments and conspiracy to cheat. The plot was uncovered following a string of no-balls bowled in a Test against England in 2010.

Butt was sentenced to two and a half years in prison, Asif was sentenced to one year and Amir received a six-month sentence.

Southwark Crown Court judge Justice Cooke said: "'It's not cricket' was an adage. It is the insidious effect of your actions on professional cricket and the followers of it which make the offences so serious."

Amir has since apologised, through his lawyer, for his role in the spot-fixing scandal.

"I want to apologise to all in Pakistan and all others to whom cricket is important. I did the wrong thing. I was trapped, because of my stupidity. I panicked," stated Amir.

Amir's mentor Asif Bajwa told The Associated Pressthat the teenager was upbeat about having his ban overturned following his release.

"Amir is in high spirits and he will meet with his lawyers to decide when to appeal in the Court of Arbitration against the ICC's five-year suspension," said Bajwa.

"Now that he has served his punishment, I am very optimistic that ICC will also look into the long term suspension."