Niall Horan has revealed that One Direction are sounding "tight" as they prepare for their upcoming world tour.

The British-Irish pop group are due to head out on their Where We Are tour from April 25, hitting continents such as South America and Europe.

The lads are now in rehearsals for the stadium jaunt and Horan updated fans on Thursday (March 27) to express his excitement.

He said: "Rehearsals goin really well ! sounds tight! Can't wait t get in that stage in Colombia! Not long now."

As previously reported, Forbes recently reported that with the addition of new US dates coupled with high sales, the Where We Are jaunt could become the eighth top grossing tour ever.

If that happens, it would be placed between The Police’s Reunion Tour and The Rolling Stones' Voodoo Lounge jaunt in the list of the highest grossing tours of all time.