Shoaib and Asif both blamed contaminated supplements.
Pakistan fast bowlers Shoaib Akhtar and Mohammad Asif have had their bans for doping overturned.
The pair were cleared by a three-man appeals committee of the Pakistan Cricket Board in Karachi.
A tribunal banned Shoaib, 31, for two years and Asif, 23, for one year on 1 November for testing positive for the banned steroid nandrolone.
Both are free to play in the World Cup and Asif has targeted a return in the one-day series against West Indies.
The first of the five limited overs was rained off in Rawalpindi on Tuesday and the next is scheduled for Thursday.
"I am fit to play international cricket," Asif insisted.
"Now it all depends on the selection committee whether they will include me."
Asif expressed his gratitude to those around him and added: "My lawyers gave me a lot of hope and my parents also supported me."
Both players insisted they did not knowingly take the drug, claiming it was present in supplements they had taken.
The appeals committee, headed by retired judge Fakhruddin Ibrahim, accepted their defence after carrying out its own investigations.
Ibrahim said: "The committe holds that Shoaib Akhtar and Mohammad Asif will not be deemed to have committed a doping offence.
"The ban and punishment imposed by the earlier tribunal is hereby set aside as being contrary to the provision of laws."
Ibrahim added it was "clearly, plainly evident that Akhtar nor Asif were ever warned or cautioned against taking supplements".
Akhtar and Asif were recalled from the Champions Trophy in India in October after they tested positive in out-of-competition tests conducted by the PCB.
Pakistan fast bowlers Shoaib Akhtar and Mohammad Asif have had their bans for doping overturned.
The pair were cleared by a three-man appeals committee of the Pakistan Cricket Board in Karachi.
A tribunal banned Shoaib, 31, for two years and Asif, 23, for one year on 1 November for testing positive for the banned steroid nandrolone.
Both are free to play in the World Cup and Asif has targeted a return in the one-day series against West Indies.
The first of the five limited overs was rained off in Rawalpindi on Tuesday and the next is scheduled for Thursday.
"I am fit to play international cricket," Asif insisted.
"Now it all depends on the selection committee whether they will include me."
Asif expressed his gratitude to those around him and added: "My lawyers gave me a lot of hope and my parents also supported me."
Both players insisted they did not knowingly take the drug, claiming it was present in supplements they had taken.
The appeals committee, headed by retired judge Fakhruddin Ibrahim, accepted their defence after carrying out its own investigations.
Ibrahim said: "The committe holds that Shoaib Akhtar and Mohammad Asif will not be deemed to have committed a doping offence.
"The ban and punishment imposed by the earlier tribunal is hereby set aside as being contrary to the provision of laws."
Ibrahim added it was "clearly, plainly evident that Akhtar nor Asif were ever warned or cautioned against taking supplements".
Akhtar and Asif were recalled from the Champions Trophy in India in October after they tested positive in out-of-competition tests conducted by the PCB.