Portuguese midfielder Hugo Vieira has signed for first division Benfica from league rival Gil Vicente, the Lisbon club confirmed.
"Hugo Vieira has signed a contract until June 20, 2016," a Benfica statement read.
The 23-year-old said that he wanted to make his mark on the first team to quickly get a call-up to the national side.
The club has already signed Dutch forward Ola John from FC Twente.
Sporting has hired coach Leonardo Jardim on a two-year contract after the worst season in its history.