The phrase "choice goalkeeper" refers to the main or preferred goalkeeper on a team. They are selected or chosen to protect the goal and play in most of the games. Full definition
I like the guy but I really think he is not ready yet to be the first choice goalkeeper. (justarsenal.com)
He was his country's first - choice goalkeeper for nearly eight years and played in four successive major tournaments. (goalkeepersaredifferent.com)
We have a policy to play the second choice goalkeeper in cup competitions — he was there when we got to the final, he deserves to play it. (justarsenal.com)