The Mongrel Mob is offering to stand guard for Muslims during their Friday prayer - but Kiwi Muslims are asking them to come inside instead.

Waikato Mongrel Mob president Sonny Fatu says his group is willing to defend Hamilton's Jamia Masjid Mosque to prevent another terrorist attack.

Waikato Muslim Association president Dr Asad Mohsin, who spoke to Fatu regarding the offer, says the sign of support gives the Muslim community strength.

"Some people from the Mongrel Mob had been visiting the mosque during the week, and said they wanted to come on Friday, show their support and solidarity," Mohsin told NZME.

"I feel very good, to receive this support from all different sections of society, different interests and dispositions, to come forward and give their love. It all gives us strength to overcome the grief we are undergoing."

But instead of protecting the mosque from the outside, he's asking them to come and join in.