Stina Blackstenius left BK Häcken and the damallsvenskan for Arsenal five days ago.
Only after a couple of days with the club did she make her long-awaited debut in the red shirt today.
In the league cup quarter-final at home against Manchester United, at the score 0-0, the Swedish coach Jonas Eidevall replaced his new acquisition in the 70th minute in favor of the shooting queen Vivianne Miedema.
But it was not a debut to remember for the Swede.
With five minutes left of regular time, Alessia Russo nodded in the decisive 1-0 goal for the guests and took United to the semi-finals of the cup game.
The Swede was not particularly involved in the game during the 20 minutes she got on the pitch.