The 33-year-old LA Galaxy striker has scored a record 62 goals in 131 internationals, 16 more than the total claimed by the remainder of the current squad. However, Keane will not meet up with his team-mates until they head to America next week, and that means there will be opportunities for others to stake a claim when the Republic face Italy at Craven Cottage today.
But Doyle said: "No-one in the world is really going to match Robbie's record - or very, very few ever - so you are comparing us against someone who has a record that is incomparable to 99 per cent of strikers in the world.
"Even the best strikers in the world don't have his goalscoring record at international level, so realistically we are not going to match that. But we can bring other things to the team and other things to the pitch that maybe he can't."