France lock Lionel Nallet has warned Les Bleus to be on their guard against Ireland this weekend – but has not been overly gushing in his analysis of Declan Kidney’s Grand Slam champions. Marc Lievremont’s team started their RBS 6 Nations campaign with a comfortable 18-9 win over Scotland at Murrayfield last Sunday but can expect a sterner test of their title credentials when the Irish visit the Stade de France on Saturday. Nallet knows the French must now put their opening victory behind them and focus on an Ireland team he considers “effective” – but nothing to get too excited about. “It will be a big fight to deliver face as we face stronger opponents than the Scots, especially up front,” he told L’Equipe. “This will be an interesting team. What’s certain is that we performed well last weekend, particularly in the scrum. But now we must forget Scotland. They (Ireland) are a European reference since they last won the tournament. But we’re here, too. We are also a reference. I do not see them as the best in the world. They are effective but their game does not make me jump. We have other ambitions at this level.” Should Ireland prevail against the Six Nations favourites at the Stade de France, it will be only their third successful visit to the French capital since 1952. Nallet is warning his team-mates that they won’t be able to switch-off through-out the 80 minutes. “It will be up to us mentally not to fall into their trap and make mistakes,” the 33-year-old Castres star added. “It is known and the coaches have insisted that they tend to lose on our turf. We must find solutions so that they do not (change that).”