The global watchdog FATF will review progress made by Pakistan in controlling terror financing and money laundering.
Pakistan, included on a so-called grey list compiled by the FATF, has been under increasing pressure to stop the financing of terror groups.
The four aides will appear before a trial court on Friday, police said in a statement.
Saeed, designated a terrorist by the United States and the United Nations, is the founder of Lashkar-e-Taiba, or Army of the Pure, the militant group blamed by the United States and India for the Mumbai attacks, which killed more than 160 people.
The United States has offered a $10 million reward for information leading to Saeed`s conviction.
The aides have been arrested on the charges of terrorism financing, counter-terrorism police said