How do i co-simulate simulink file with spice/ verilog ams netlist ?

Suppose I have a simulink model for a feedback loop with various sub blocks. I want to replace one of the sub blocks with its spice / verilog ams / verilog a counterpart and simulate in simulink. Assume I don't have access to Cadence pspice / spectre but only have LTspice foe example.