Rescan for matching kernel modules

So normaly during boot or when a device is hotplugged Linux loads kernel modules for hardware based on modaliases. Is there a way to manually trigger this for a specific device or a general "rescan" for the whole system? e.g. I have a pci device which had no matching driver during boot. Then I install a driver package with several modules. Now I want the system the automatically pick the right one based on modaliases and load it like it would on a reboot, without actually rebooting.