Import audio from cassette player to 2014 iMac
I want to import the audio from my old cassette tapes into my late 2014 iMac running Yosemite 10.10.4. A search of the forums hasn't thrown up any suggestions. The iMac does NOT have a line-in port, only USB so I can't use an RCA to line-in plug cable as I used previously. I have used Audacity as the software to import to the Mac. So the question is what do I need to use to connect the cassette player to the iMac?
Can I use an RCA (only using the red and white plugs, not the yellow) to USB cable? Or do I need some type of converter?
Thanks for any suggestions.
Geoff
iMac (27-inch, Late 2013), OS X Yosemite (10.10.4)