Tottenham suffers defeat of their Europa Conference League play-off first-leg tie
Lucas Silva's well-taken goal on the stroke of half-time that proved the difference between the two teams heading into the return leg in north London next Thursday
Sebastian Nkrumah Listowell 
Tottenham Hotspurs manager Nuno Espirito Santo suffered his first defeat as head coach for the Lilywhites so far as this season is concerned.
Pacos de Ferreira only goal of the game saw the Portuguese club edge a narrow win over Spurs in the Europa Conference League play-off first-leg tie.
The second leg is at the Tottenham Hotspur Stadium next Thursday.
A youthful and inexperienced Tottenham side lost 1-0 at Pacos de Ferreira in the first leg of their Europa Conference League play-off tie on Thursday.
The visitors made 11 changes from the team that beat Man City in their Premier League opener on Sunday, with head coach Nuno Espirito Santo handing full debuts to new signings Pierluigi Gollini, Cristian Romero and Bryan Gil.
However, it was Lucas Silva's well-taken goal on the stroke of half-time that proved the difference between the two teams heading into the return leg in north London next Thursday.
Spurs headed to Portugal having left behind every player who featured against the Premier League champions on the weekend, allowing Nuno to get the first glimpse of summer signings Gollini, Romero and Gil.
Gollini also impressed in goal with some confident handling in the first half as the hosts, who finished fifth in the Portuguese league last season, gradually grew into the contest in Porto, before deservedly taking the lead just before the break.
It was the third new signing, though, who was partly at fault as Romero and his fellow centre-backs were split open by Castro Ferreira's through ball, allowing Lucas Silva a clear run on goal.
The striker kept his cool to slide his low shot past the advancing Gollini as the home team led at the interval, with the visitors struggling thereafter to get back into the contest.
