''Match referees and umpires have spotted 41 bowlers from different teams and regions whose actions are not right. They remain suspended until further work is done on them,'' Saleem Altaf, director of cricket operations, told Reuters.
Pakistan has faced repeated problems with its bowlers in recent years.
Pacer Shabbir Ahmed is serving a 12-month ban imposed by the International Cricket Council (ICC) after being reported twice in 2005 while fastman Shoaib Akhtar has been reported three times since his debut in 1997.
Pakistan has also had three of its under-19 players who appeared in the ICC Youth World Cup reported by match officials.
''This is a major problem for us. But we are trying our best to resolve it and set a proper system in place to spot such bowlers,'' Altaf said.
The board would send the best players for remedial work under the supervision of coaches at the national and regional cricket academies, he said.