The production team would certainly have to make the necessary arrangements.
If their investment percentage wasn't high, they could forget about having a say in the male or female leads.
Some production companies have limited funds and need investors to contribute a large share. This is common with small companies or directors trying to get a series off the ground. Many directors don't have any money to invest themselves and rely entirely on financiers.
So, if a financier invests a large sum, it's certainly possible for them to insert their own male or female lead.
That's why, a lot of the time, it's not that directors want to use actors with no talent. They're forced on them by the financiers, and there's nothing they can do about it.
