It's almost the end of leg one of One Direction's summer tour and the boys have taken to their Twitter accounts to thank their fans after their recent concert in Madrid.

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Niall Horan tweeted, "Madrid , that was absolutely unbelievable , thank you so much! Electric atmosphere." While Louis Tomlinson wrote, "Great great show tonight ! Thank you !!"

Tomlinson had to rush back to Spain after making a quick trip to England for his girlfriend Eleanor Calder's college graduation from Manchester University. The Manchester Evening News reported that Tomlinson made a low-key appearance at the University for his longtime GF. Tomlinson was watching "quietly from the wings."

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"He was a bit late for the start of the ceremony and he did not want to create a big fuss. He crept in and kept a really low profile," a source told the paper. "There were around 400 people there at the ceremony and hardly anyone clocked that it was him."

Before that, Tomlinson and Horan both got the opportunity to play some soccer while touring Barcelona. The two visited the Nou Camp and were able to kick around the ball." I have been here a few times before, and it's nice to be back. This is one of the best stadiums in the world, and it was incredible to get the chance to walk out on to the pitch," Horan said. He later instagramed a photo of himself and Tomlinson in their jerseys with the caption "What an amazing day!"

The 1D boys, including Zayn Malik, Harry Styles and Liam Payne, have one more concert in Madrid before going to Porto. They then start the North American leg of their Where We Are tour in August in Toronto.

Tags: One Direction Louis Tomlinson Niall Horan