Hi Maki My bridge is a bit different from the original text, but it's "meaning only".
Here it goes:
From today, the keeper Matej Delac who is 15 years old, is going to train in Seixal's team as an experience.
The croatian keeper arrives today at Lisbon and he'll go immediatly to Seixal, where he'll start to convince the red coaches that he has the skills to train in this team.
Delac belonged to (the team of) MK Inter Zapersic.