Atlético Madrid midfielder Gabi Fernández admits Jackson Martinez didn't fit in.
Martinez moved to Chinese club Guangzhou Evergrande last week.
"When he signed we were all really excited. Jackson came from Porto, where he was the top scorer and one of the top strikers.
"The reality was that it didn't work out. We all saw that Jackson didn't fit into the squad, because of his way of working. But he was never blamed because he wanted to do his best when he signed," Gabi told Radio Marca.