Riaz was not picked for Pakistan’s last two series against Sri Lanka and Bangladesh for unknown reasons.
Spokesman Nadeem Sarwar said in a statement the PCB approached the anti-corruption unit ”as a precautionary measure” to seek any relevant information about Riaz.
”In the absence of any observation, the PCB proceeded with selecting Wahab (Riaz) for the England series,” Sarwar said.
Three Pakistani cricketers are in prison in England after they were found guilty of spot-fixing during a test match against England in 2010.
Former captain Salman Butt was sentenced for 2 years, fast bowler Mohammad Asif for 1 years and young paceman Mohammad Amir for six months.
Wahab, 26, was a key component in Pakistan’s bowling lineup in the absence of Asif and Amir in 2011.
