There's a lot of frustration inside La Masia seeing Gabriel Martinelli's success with Arsenal.

The young Brazilian striker, signed from little FC Ituano over the summer, has been a revelation for the Gunners this season.

Mundo Deportivo says questions are being raised inside Barca over how they managed to allow Martinelli to slip the net.

The striker had a week trialling at La Masia as late as January this year, where he worked with both the Juvenil A and B teams, but Barca directors passed on his signing.

The 18 year-old joined Arsenal six months later for €6m.