Chelsea loanee Kenneth Omeruo came off the bench to make a winning debut in La Liga with CD Leganes as they beat Rayo Vallecano in a Madrid derby for the very first time.
Omeruo was introduced after 29 minutes as Leganes went on to win 1-0 courtesy of a 14th minute goal.
He was solid at the back and generally acquitted himself nicely.
He has battled match fitness problems as well as his paper work before his much-anticipated bow.
Should he impress on a season-long loan spell in Spain, Leganes have the option to buy him outright from Chelsea.
The modest Madrid club are now 18th on the 20-team table with seven points from eight matches.
Last season, they barely escaped relegation.