If you have no other options, like a friend or relative keeping him, you do whatever you can to mimimize any chances of spreading anything between them. If you have to keep them in the same room, then you have to work with that. Keep them as far apart as possible. Don't share any equipment like feeding tongs, hides, water bowls, etc between them. Make sure to wash/disinfect your hands when working with them. Make sure the room has plenty of ventilation.
Not everyone has a separate building, or even a separate room to set up a quarantine. You just have to work with the situation you're in. Odds are everything will be fine...
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