Chelsea booked their place in the semi-finals of the League Cup on Tuesday, defeating Newcastle United 4-2 in a penalty shootout at Stamford Bridge after substitute Mykhailo Mudryk kept the Blues alive with a 92nd-minute equaliser.

Newcastle had appeared set to snatch a 1-0 win in west London until Kieran Trippier, on as a substitute, failed to cut out a Malo Gusto cross and allowed Mudryk, also on as a sub, to slot home, levelling the tie at 1-1 and taking it to penalties.

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England defender Trippier turned a bad night into a disastrous one when he fired Newcastle's second penalty wide before Matt Ritchie saw his effort saved athletically by Chelsea's Djordje Petrovic, making only his second start in goal for the Blues.

"Trips is an incredibly strong character," Newcastle manager Eddie Howe told reporters. "When he's given us so much, now's our turn to support him and look after him the other way and that's what we'll do."

Chelsea had gone behind in the 16th minute when Callum Wilson, surrounded by Chelsea defenders, pounced on an error by Benoit Badiashile who got the ball caught in his feet allowing Wilson to flick his finish past Petrovic.

The hosts dominated possession throughout the game but struggled to break down a well-drilled Newcastle defence.

They brought French forward Christopher Nkunku off the bench for his first competitive appearance for the Londoners having suffered a knee injury in pre-season shortly after his transfer from RB Leipzig.

But the expensively assembled Blues, who have struggled for a second straight season in the Premier League, had seemed destined to throw away a precious chance of silverware until Mudryk's late strike.

"Obviously it means a lot. Sometimes things happen when you trust in each other and believe until the end," the Ukrainian, who has struggled to find his feet since signing for Chelsea nearly a year ago, told Sky Sports.

"Sometimes when the game is tough you need to keep pushing and believe until the last second because it's football and everything can happen."

Mudryk was one of four Chelsea players to score in the shootout, along with Nkunku, Cole Palmer and Conor Gallagher.

Chelsea, in their first season under Mauricio Pochettino, are pinning their hopes on the domestic cups as they currently sit 10th in the Premier League and did not qualify for European competition.

The defeat for Howe's Newcastle -- without a major trophy since the 1950s -- represents a second blow in the space of a week after they were eliminated from the Champions League last Wednesday.