Yes, you can, but you have to be careful in how you set them up. The thing that will cause you the most headaches in getting them setup is if you try to use the same network of IP addresses on both routers. You must make sure that both networks have unique numbers in the third position. IE: 192.168.1.1 for the wired router, and 192.168.2.1 for the wireless one. Then everything will work, but you will be in a double NAT situation which has its own limitations. Computers on the wired router won't be able to access anything connected to the wireless router.