Liverpool proved last season that summer defeat to Borussia Dortmund in the United States needn't prompt a significant inquest.

But Jurgen Klopp has no doubt been given points to ponder after his side's winning start to pre-season was brought a shuddering halt by his former club.

A 3-2 defeat at Notre Dame Stadium in Indiana wasn't the ideal opening to a US tour in which the Reds remain without several key names, not least attacking triumvirate Mohamed Salah, Roberto Firmino and Sadio Mane.

By contrast, Dortmund went strong in their starting line-up and that greater class told at times from a team that finished second in the Bundesliga last term.

See how Liverpool's players rated in their defeat to Borussia Dortmund HERE

Liverpool , though, were their own worst enemy at times, with some sloppy defending that started with the opening goal after only three minutes.

Nathaniel Clyne dozed in dealing with a cross from the right, and although the full-back prevented Giovanni Reyna from getting a shot away, the ball dropped for Paco Alcacer to slam home from six yards.

Joel Matip, Ryan Kent and Harry Wilson all came close before Liverpool drew level 10 minutes before the break.

The excellent Fabinho played a ball forward from the edge of the area and Kent's dummy allowed it to roll into the path of Wilson, who tucked home into the bottom corner.

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Liverpool in the United States

Dortmund, though, scored twice in five minutes after the interval, Jacob Bruun Larsen's cross tapped in by Thomas Delaney on 53 minutes before Bruun Larsen himself netted from close range after being fed by Marius Wolf.

After Klopp replaced his outfield players on the hour, Rhian Brewster scored from the spot on 75 minutes after Ben Woodburn was pushed by Mateu Morey.

Liverpool now jet off on Saturday morning for Boston to prepare for Sunday's friendly against Sevilla at Fenway Park.

Ox starts to find his rhythm

It was exactly the reason Liverpool spent that £35million.

Picking a loose ball up in midfield midway through the first half, Alex Oxlade-Chamberlain saw the space in front of him and, a split second later, he was off, bursting towards the Dortmund penalty area.

His eventual cross was good, too, with only a good save from Marwin Hitz preventing Ryan Kent from notching at the far post.

That ability to break out of the engine room tussle and beyond the forwards is, if hyper-critical, the one aspect that was largely missing from Liverpool's midfield last season.

Alex Oxlade-Chamberlain in action against Borussia Dortmund

Oxlade-Chamberlain featured for only 19 minutes last season as he continued his recovery from the serious knee injury that sidelined him for more than a year just as he was hitting his stride after arriving from Arsenal.

Pre-season, then, represents an important opportunity for the 25-year-old to remind his manager, the supporters and perhaps even himself of what he can contribute.

Not everything he tried here came off – his passing wasn't quite on point at times – but there was sufficient encouragement against opposition a significant step above what had come before this summer.

Klopp has declined pursuing an attacking midfielder in recent transfer windows, such is his faith in Oxlade-Chamberlain. We're starting to see why.

Harry's game in wing race

On the big screen at the Notre Dame Stadium, Harry Wilson was all smiles as he accepted the congratulations of Ryan Kent .

The pair had demonstrated in Liverpool's equaliser – Kent with a clever dummy, Wilson a cool finish – the talent that helped them impress at Rangers and Derby County respectively last term.

Jurgen Klopp, though, is the man they must now convince, the Reds boss giving them an extended spell in which to stake their claim.

Both players were denied by Dortmund keeper Marwin Hitz as Liverpool probed during the first half.

Harry Wilson of Liverpool scores during the pre-season friendly match between Borussia Dortmund and Liverpool FC at Notre Dame Stadium on July 19, 2019 in South Bend, Indiana. (Photo by John Powell/Liverpool FC via Getty Images)

But if Kent caught the eye at Bradford City on Sunday, here it was Wilson's turn, the Welshman visibly growing in confidence after his strike.

How either would prosper in a forward line that includes one or more of regulars Mohamed Salah, Roberto Firmino and Sadio Mane is the judgement Klopp is seeking to make.

With three weeks before the Premier League season starts, the pressure is being cranked up. It's not now or never, but both Kent and Wilson know this has to be their time to shine.

Larouci's tough lesson as Brewster at it again

Yasser Larouci was within a minute of further bolstering his swiftly burgeoning reputation.

Now clearly ahead of Adam Lewis as the duo attempt to prove they can deputise for Andy Robertson at left-back and save Jurgen Klopp a transfer market foray, the 18-year-old was given a full hour in front of a Notre Dame Stadium crowd in which Reds supporters dominated the 40,361 attendance.

They saw Larouci do well up against Jadon Sancho, only nine months older than the Liverpool youngster but light years ahead in terms of experience.

The teenager demonstrated his rawness by being booked for a foul on Julian Brandt.

Rhian Brewster of Liverpool celebrates with Jordan Henderson after scoring a penalty during the pre-season friendly match between Borussia Dortmund and Liverpool FC at Notre Dame Stadium on July 19, 2019 in South Bend, Indiana. (Photo by John Powell/Liverpool FC via Getty Images)

And just before he was due to be replaced came a reminder he was only switched to left-back from left wing 12 months ago, losing possession when attempting to dribble out of his area, a mistake which ultimately led to Dortmund's decisive third goal.

The final half-hour saw Virgil van Dijk, Jordan Henderson, Andy Robertson, Trent Alexander-Arnold and Gini Wijnaldum given their first minutes of pre-season.

However, it was Rhian Brewster who gained most from the closing action, thrashing home a penalty for his fourth goal in three games so far this pre-season. He remains the true breakout star of the summer.