After dropping points in September, the Blues have now rallied to move top of the Premier League under Antonio Conte.
Conte’s men were held to a 2-2 draw by Swansea and beaten by rivals Liverpool and Arsenal two months ago but they have now won seven league games in a row to move one point above Liverpool.
They were too strong for Tottenham on Saturday in a 2-1 win with Pedro and Victor Moses grabbing the goals at Stamford Bridge.
Conte has refused to get carried away and Alonso agrees, but the Spaniard is also confident nobody will be able to match them if they can continue to produce the same standard of performances.
“We’ve got to go game by game and we will see at the end of the season,” he told Chelsea TV.
“But if we’re still playing this way, with this passion, with this energy, it’s going to be tough to beat us.”
Antonio Conte took the opportunity to compliment a rare talent after Lionel Messi masterminded Barcelona's Champions League defeat of Chelsea.
Wigan boss Paul Cook is happy to be heading into their FA Cup quarter-final with Southampton on the back of a morale-boosting league win.
Arsene Wenger has called on his Arsenal side to put on the sort of displays that will have stay-away fans returning to the Emirates Stadium.
Michael Jacobs struck in stoppage time as Wigan got their League One promotion bid back on track with a 1-0 win at Bradford.
Lionel Messi punished error-prone Chelsea as Barcelona advanced to the Champions League quarter-finals with a 3-0 win at the Nou Camp.