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His final games for the club were marked by a struggle to stay in the Football League, but incredibly in such a short space of time the side has been transformed into one preparing for Championship football next season after sealing the League One title with a game to spare.
Scunthorpe have caught the eye of spectators around the world this season, with one noteable fan in northern Spain a keen follower.
"I would like to congratulate everyone linked to the club because everyone has their little bit of responsibility for the club's success," Calvo-Garcia told Iron-Bru.net.
"SUFC must now look ahead. The question now is where do we want to be? As a club, even as suporters. What is next? If we want to stablish the club in the Championship we must plan for the future and move another step forward.
"The most dangerous thing after a successful season is to believe that you are done. The supporters also will be very important as SUFC needs lots of support to compete at this level.
"Next year will be a season full of challenges. Ours as supporters is very clear: can we fill the ground week in week out?
"Why not make Scunthorpe known all over the country for the great support and loyalty shown by the supporters?It is our opportunity to make history and we can choose how."
Calvo-Garcia arrived at Glanford Park when Mick Buxton was in charge, but it was the appointment of Brian Laws - and his subsequent move into midfield - that saw him shine.
Nigel Adkins was physio during the midfielder's time at the club, and he is not surprised at the remarkable impact Adkins has had since taking over in the dugout from Laws.
"I know Nigel very well and to me it is not a surprise to see how well is handling the team - he is just being himself," said Calvo-Garcia.
"He was passsionate about his job as physio and he is being equally passionate as manager. He is always positive.
"There is one great thing about Nigel, and this is that he first see you as a person and he can listen to you.
"Nigel knows very well that the importance is in the group, not the individuals. He once explained to me what exactly what the word TEAM means and that is exactly the idea I try to passs to children I coach in football."
Calvo-Garcia made the trip to London for the League game against Leyton Orient earlier this season, getting a fantastic reception after choosing to go in the away end with fans.
"I said when I left that from then on I was just one more supporter," he added
"I take all this people in my heart because they gave me eight wonderful years, made me feel athome in a foreign country and with time became one of them.
"To me was a wonderful experience sitting down with them and one that I will repeat. The reception was amaizing I can't express how deep I feel about the club and its people."