Jenson Button has warned that his McLaren team could be in for a tough weekend after struggling to match the pace of rival teams during Friday's practice sessions for Sunday's European Grand Prix here. The 30-year-old McLaren driver finished the day ninth quickest and fears that chances of a third successive one-two for McLaren are very slim. McLaren had matched the pace of the high-flying Red Bulls at the two previous Grands Prix in Istanbul and Montreal, but the defending drivers' champion is concerned that the pace of updated teams Mercedes, Renault and in particular Ferrari might be a struggle top match. 'The car feels pretty good. The only problem is there are lot of quick cars out there - the Ferrari looks very, very fast.' said Button. 'Even the Renaults and the Mercedes look very competitive as well. It's going to be a tough weekend for us, but enjoyable as well. 'We don't have an upgrade here and most teams do so it's always a little bit tricky. But at Silverstone we do have an upgrade and we just have to fight it out here and get the best out of what we have.' His McLaren team-mate and fellow Briton Lewis Hamilton also conceded that things looked much tighter at the top, but was more positive about his team's chances. 'It wasn't too bad today,' said the 2008 champion, who currently tops the drivers' standings with a three-point advantage over Button. 'The first session was quite good and then inevitably, like I said yesterday, I felt that the others.. it's going to be interesting to see how fast they are. 'They are looking very, very competitive, but mostly on the single lap rather than the race pace. 'I think our race pace is closer but through the high-speed corners is difficult for us to touch them. 'Nevertheless we'll still push. It's not damage limitation but just getting as much as we can from them while they have the advantage.' 