Eddie Howe felt Newcastle were dealt a “lesson” on the fine margins of the Champions League as Borussia Dortmund handed the Magpies a first defeat of their campaign.

After a goalless draw at AC Milan and a 4-1 win over Paris St Germain last time out, Newcastle were brought back down to earth as Felix Nmecha’s controlled finish gave Dortmund a 1-0 victory.

On a rain-sodden night at St James’ Park, Callum Wilson was denied by a superb save from Gregor Kobel then the crossbar while Anthony Gordon’s deflected strike also came off the goal frame late on.

Newcastle, though, lacked some impetus as a nine-game unbeaten run in all competitions came to an end, leaving them third in Group F, level on four points with Dortmund and two behind table-topping PSG.

“It was always going to be tight,” the Newcastle boss said. “There are top-quality teams in the group. Tonight is a blow, especially (losing) at home. A lesson in how fine the margins are going to be.

“The ball just wouldn’t go in for us. It was one of those nights. Callum had the first chance of the second half, that was a good one and then we hit the bar twice but just couldn’t force it in.

“Credit to the players, we never gave up, we kept doing the right things. We looked like a goal threat. But we have to be at our best to win and if you dip below that, it is tough to get results at this level.

“Any mistake you make is liable to get punished. We made one and seconds later we conceded so there is stuff we could have done better and when we analyse in the cold light of day, we will take a lot.”

A return trip to Dortmund in a fortnight’s time could prove instructive as to whether Newcastle will progress to the last 16 on their first appearance in Europe’s elite club competition in 20 years.

Their loss on Wednesday night was compounded by Alexander Isak limping off a quarter of an hour in with what appears to be a recurrence of a groin strain while second-half substitute Jacob Murphy was withdrawn five minutes after his introduction with a suspected dislocated shoulder.

“You look at some of the injuries, they are quite difficult to get your head around but we have to adjust,” Howe said.

“We can’t analyse too much, we have to regroup the players. We’re still in a very good position in the Premier League and Champions League.

“(The return game against Dortmund) is going to be hugely important. The next two away games, the league table looks very, very tight so they are great games for us, we have to approach them like that.

“Our lads are very honest and very focused on trying to win and achieve, there are some tired bodies and we have to recover for (the Premier League game at) Wolves (on Saturday).”

Dortmund head coach Edin Terzic hailed the display of Nmecha, who settled the contest after exploiting some space on the edge of the area and coolly slotting Nico Schlotterbeck’s cross beyond Nick Pope.

Nmecha, a former Manchester City youngster, was signed by Dortmund from Wolfsburg in the summer to fill the vacancy left by England midfielder Jude Bellingham, who left the Bundesliga club for Real Madrid.

“Felix is a brilliant player and we know about his potential and his talent and we knew he could improve our game – he had a fantastic game,” Terzic said.

“He finally managed to score, he had many opportunities in the first games of the season. This was a different role, he played more attacking. He had a rocky start in Dortmund and now he is in good form.”

As for Howe’s comments about Newcastle being given a lesson by Dortmund, Terzic responded: “That is nice to hear but it is just half-time, we face each other in a couple of weeks.

“We deserved in the first half and protected in the second half. We needed to be passionate, have some luck and a good goalie and we had all of that.”

Felix Nmecha dented Newcastle’s Champions League charge as Borussia Dortmund kick-started their Group F campaign with a 1-0 victory on Tyneside.

The Germany midfielder’s 45th-minute strike clinched victory at a rain-soaked St James’ Park on a night when three more points for Eddie Howe’s men, who twice hit the crossbar late on, would have left them with one foot in the last-16.

They will now head into tough away games in Dortmund and against Paris St Germain next month with serious work to do to extend their stay in the competition.

And they will possibly have to do it without midfielder Sandro Tonali, who was used as a second-half substitute amid speculation he could be handed a lengthy ban for alleged breaches of betting rules.

Memories of Newcastle’s 4-1 demolition of Paris St Germain earlier this month faded as last season’s Bundesliga runners-up produced an accomplished away display to remind them that the race for qualification from Group F has a long way to go.

In a frenetic start to the game, Nick Pope had to block Donyell Malen’s second-minute shot with his legs after he had controlled Marius Wolf’s cross as Dortmund broke at speed, but opposite number Gregor Kobel had to be equally resilient seconds later when Anthony Gordon cut inside and unleashed a curling attempt.

But it was the Newcastle keeper who had to produce a brilliant double save to deny first Malen and then Niclas Fullkrug from point-blank range after Emre Can had dispossessed Sean Longstaff and sent Marcel Sabitzer away down the left wing.

However, as played switched rapidly from end to end on a slick pitch, Kobel came to the German side’s rescue within seconds when Alexander Isak raced towards goal from halfway before sliding a pass into the run of Gordon, whose left-foot strike was beaten away by the goalkeeper.

Pope was relieved to see Malen whip a first time shot from Marco Reus’ square ball over his crossbar.

The Magpies were forced to make a change after only 15 minutes when Isak, who had earlier undergone lengthy treatment on the pitch, limped off to be replaced by Callum Wilson.

Miguel Almiron saw appeals for a 20th-minute penalty waved away by Portuguese referee Artur Dias after he went down under Nico Schlotterbeck’s challenge after carving his way into the box, with the breakneck tempo of the game showing few signs of abating.

With Can and Sabitzer providing the ammunition and Reus linking play, the visitors continued to cause problems and Jamaal Lascelles had to block another Malen shot at the end of an intricate passing move.

Dortmund, who had earlier replaced the injured Can with Salih Ozcan, finally forced the breakthrough in the final minute of the half when Sabitzer robbed Gordon and Reus fed Schlotterbeck, whose cross was steered emphatically past Pope by former Manchester City youngster Nmecha.

Wilson passed up a glorious opportunity to level 12 minutes after the interval when, after Fabian Schar’s crunching tackle in midfield had sent the ball into his path, he exchanged passes with Gordon before his shot was blocked by Kobel.

Howe made his move with 25 minutes remaining when he sent on Tonali and Jacob Murphy, who lasted just five minutes before having to leave the pitch with his shoulder in a makeshift sling.

But his side struggled to create anything of note until Wilson headed an 87th-minute free-kick against the bar and Almiron repeated the feat in stoppage time with a deflected shot.