Trent Alexander-Arnold’s first Liverpool goal set Jurgen Klopp’s men on their way to a 2-1 Champions League play-off round win away at Hoffenheim in Tuesday’s first leg.

The Reds, again without want-away star Philippe Coutinho, dug in against tough opponents and found inspiration in the unlikely form of their teenage right back, before James Milner’s effort – deflected in off Havard Nordtveit – widened the margin and Mark Uth hit back.

For 35 minutes, European debutants Hoffenheim delivered the type of high-energy display so readily associated with Klopp, who could hardly have complained had Andrej Kramaric’s penalty handed the hosts the lead and not invited a simple Simon Mignolet save.

But Alexander-Arnold, with a confidence belying his tender years, swept an exquisite free kick into the corner of the Hoffenheim goal 10 minutes before half-time, and Julian Nagelsmann’s side never really recovered.

Liverpool squandered numerous further chances and looked set for a nervy finish until Milner’s cross-cum-shot drifted over Oliver Baumann via Nordtveit to seemingly secure victory at a stadium where Hoffenheim were unbeaten in the Bundesliga last season.

However, substitute Uth drifted in behind the visitors’ defence with three minutes remaining to lash a superb effort past Mignolet and keep the German side in the tie going into the second leg next week.

Liverpool’s back line, in an as entertaining 3-3 draw at Watford on Saturday, looked shaky from the off, and Dejan Lovren had already survived one penalty appeal for handball when he clumsily clipped Serge Gnabry in the area and referee Bjorn Kuipers pointed to the spot.

But Kramaric’s tame penalty bailed out the Reds defender, allowing Mignolet to firmly palm clear, and Mohamed Salah should have then put the visitors in front as he ran from the halfway line and prodded a tired finish past the right-hand post.

The frantic early pace soon slowed, but Hoffenheim’s relentless pressing did not, with Jordan Henderson caught out and Kerem Demirbay crossing for Pavel Kaderabek to lash wildly over the top.

However, a moment of outstanding quality from Alexander-Arnold halted the hosts in their tracks, the 18-year-old firing a magnificent 25-yard free kick beyond Baumann.

The response was strong and Mignolet blocked well from Gnabry before Sandro Wagner drilled the rebound against the outside of the post.

But back came Liverpool and Lovren nodded just wide on the stroke of half-time, with Roberto Firmino, against his former club, and Sadio Mane each then testing Baumann after the restart.

Predictably, with the clock winding down, Hoffenheim’s efforts to preserve their fine home run became increasingly desperate. Instead, further chances fell the visitors’ way as Baumann saved first from Salah’s shot, and then from Lovren’s header.

With 16 minutes remaining, though, the second goal did arrive; Milner, in space on the left, appeared to look for a teammate with his right-footed cross, but instead found Nordtveit’s chest and subsequently the far top corner.

A fine late Mignolet block kept Demirbay at bay, but Uth then thrashed past the goalkeeper to halve the deficit and keep Hoffenheim in the hunt in the closing stages of this home leg.

And the hosts should have equalised in stoppage time when Benjamin Hubner nodded Demirbay’s set-piece inches over the crossbar, but Liverpool held on.