Vice-captain, alternate captain (ice hockey) or vice-skip (curling) may refer to a role in a number of sports immediately below the role of captain. The vice-captain may have a number of different roles, including substituting as captain when the regular captain is injured or unavailable, or becoming the new captain if the original captain can't actually be the captain anymore.
A deputy leader, substitute leader (ice hockey) or deputy skipper (curling) could represent a position in various sports immediately beneath that of a leader. The deputy leader may assume the role of captain if the regular leader is unavailable or unable to lead.