You can play with friends in co-op in FIFA 21‘s Ultimate Team‘s Seasons mode. To do this, simply press Triangle on PS4 or Y on Xbox One when the two teams pop up (with their stats, etc.) Pressing this button will add a guest to your team. That’ll be your friend, so do this before readying up and have your friend ready to go with a controller.
However, if you want to put each other’s Ultimate Teams to the test in FIFA 20, you can! To do this you can play people off your friend list in an online friendly by selecting the Online Friendlies mode. From here, you need to select the friend you want to invite off your friends list. Once they accept the invite, you’ll be all set.