Russia boss Dick Advocaat is in no doubt Republic of Ireland captain Robbie Keane will pose as much threat as ever in the Euro 2012 qualifier.[LNB] The Tottenham striker has had to make do with opportunities off the bench in the Premier League, scoring his only goal so far in the Carling Cup defeat by Arsenal.[LNB]Keane's other goal of the campaign came in the Republic's last match, a 3-1 win over Andorra, and he will be looking to add to his record tally of 44 at the Aviva Stadium in Dublin tonight.[LNB]Advocaat admitted to concerns about a lack of playing time at club level for some of his own players, including Chelsea's Yury Zhirkov, but he does not think it will affect Keane.[LNB]"I'm a great admirer of Keane because he's always there, he always likes to play for his country," said the former Rangers boss.[LNB]"I can understand, if you play for a team like Spurs, then you know there are so many talented players there that you're not always a regular.[LNB]"But I don't think it's a big problem for him because his heart is right for a footballer."[LNB]Russia began the campaign as the favourites to top Group B but their hopes were dented by a surprise home defeat at the hands of Slovakia, who the Republic play on Tuesday in Zilina.[LNB]And, despite tonight's encounter being only their third of the qualifying phase, Advocaat already believes they are in a scenario where they dare not lose.[LNB]He said: "There is always pressure in qualification games but there is certainly pressure after the defeat by Slovakia. We know the importance of this game - a win or a draw but we cannot lose.[LNB]"We have a way of playing and if everyone is there we are a good team. They have to show they can play football but they must also have confidence in themselves.[LNB]"I was really disappointed with the result against Slovakia but I was not disappointed with the commitment of the team.[LNB]"I have the feeling the players are in better form, the players are playing more regularly for their club sides so I have a much better feeling than I had before."