Currently fifth in the league following their Boxing Day victory over Chelsea at the Valley, Alan Curbishley's side have also recorded a home win over Liverpool and a share of the spoils with Arsenal.
Robbie commented that Charlton are more often labelled as 'hard working', rather than a talented team ahead of their trip to the Lane on Sunday.
"They do keep getting results and are a team that people do not give enough credit for how good a side they are.
"It is said that they work hard for each other - which they do - but they have tremendous players as well. It is going to be a very tough game but, at home with the crowd behind us, hopefully we can get a result."
One player in the Charlton ranks that Robbie does have an affinity with is hugely skilled playmaker Paolo di Canio, the former West Ham skipper now enjoying a Premiership swansong at the Valley.
"I think you have to admire someone of his ability," added Robbie. "He is tremendous player and he has done it for years now.
"It will be nice to play against him, but I hope he doesn't do too well on the day. He is a fantastic player though and I respect him."
Robbie Keane suspects that Charlton do not get the credit they deserve for their Premiership exploits.