Horan, 23, called Tomlinson "an unbelievable guy", who was an integral part of the group, reported FemaleFirst.
"He's an unbelievable guy, a great singer and someone that if, I'd say, we would have lost the plot along the way if we hadn't had Louis," Horan told Australian radio station Nova 100 in a show.
Recently, the "Just Hold On" singer had said in an interview that he was considered "forgettable, to a certain degree" by some of the fans when he was a part of the boy band.
"I thought it was very honest interview, I thought he was brilliant in it. He knows that none of us ever thought that or think that," he said.
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