Liverpool midfielder Javier Mascherano admits his team-mates should be 'worried' by the 'great things' his countryman Carlos Tevez is capable of achieving with Manchester United.
Tevez sealed his protracted switch to Old Trafford from West Ham earlier this month and made his debut in United's midweek draw at Portsmouth, creating Paul Scholes' goal.
The pressure will be on the Argentina striker over the coming games due to the absences of injured Wayne Rooney and Cristiano Ronaldo, who is suspended for three games.
But Mascherano is sure he will be able to flourish under United boss Sir Alex Ferguson and has voiced concern over the impact he could have on the Barclays Premier League title race.
'The arrival of Carlos is a double-edged sword,' he said in the Sunday Mirror. 'I am happy for him, but, because he has gone to a rival club, I am worried about him because he can do great things.
'Carlos is an explosive forward and is able to unbalance any defence. He is a big danger to everyone in this league.
'United have some great attacking players with Carlos, Wayne Rooney and Cristiano Ronaldo. They are all quick, fast and will get a strong understanding between them.'