Caicedo joins on-loan to June and is reunited with his former Lazio coach Simone Inzaghi.
He said, “I worked with him for four years at Lazio and now we are together again at Inter. His presence was very important and immediately convinced me, so I thank him and can't wait to get going.
“I spoke to Tucu Correa as well and he told me everything. He was my teammate at Lazio for three years and I was missing him, so I'm glad we're working together again."
Caicedo added: "I am eager to do well and first of all must thank coach Inzaghi, as he did everything to get me here
“I am very happy and can't wait to start training and playing for Inter. I'm very proud to be able to represent my country and be the first Ecuadorian at Inter."