The Irish struck a hat-trick for the Republic of Ireland last night against Faroe Islands.
Donovan said: "Aside from all the special things Robbie does, he occupies people. Even when he's not scoring in games, he's a threat and he's something the other team has to worry about. When he's not on the field, it makes it a lot easier for teams to key in on a few guys. Just his presence is effective, and then when he's playing well, it makes it that much more dangerous for our whole team."