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With this, the total number of persons arrested in the case has gone up to seven.
D K Rao, a close aide of Rajan was arrested in connection with the firing incident, after he was extensively questioned on Monday, a senior police officer said.
Rao is likely to be produced before a court later on Tuesday, the official added.
One of the arrested accused, Umed Ul Rehman, had indicated Rao`s role in the firing incident during his interrogation, police said.
Two gunmen had fired outside Kaksar`s residence on Pakmodia street in south Mumbai on May 17, killing Kaskar`s bodyguard-cum-driver Arif Syed Abu Bukha. Kaskar was not present at the site when the incident happened.
Rehman (27), a sharpshooter and active member of Rajan`s gang, and his associate Aasid Jaan Mohammed Shaikh (41) were apprehended in Goa on Thursday and subsequently arrested.
Two shooters Syyed Ali (29), a resident of Mumbai, and Indra Khatri (27), had earlier been arrested near J J Hospital while they were trying to escape after the firing.
Two more accused Abdul Rashad Shaikh (21) and Adnan Idaayad Sayyed (21), who had allegedly shown the target - Kaskar`s driver Bukha - to the two shooters, were arrested on May 25.