Plymouth boss Steven Schumacher said his players should be "extremely proud" after taking Chelsea to extra-time before they were finally beaten 2-1 at Stamford Bridge.

Kepa Arrizabalaga's penalty heroics helped the Blues avoid a shootout as they edged past Argyle 2-1 in the FA Cup fourth round, having been forced into playing an extra half-hour by the plucky League One side.

The Spain goalkeeper guessed correctly and then smothered Ryan Hardie's last-gasp spot-kick, after the Plymouth striker had been felled by Malang Sarr.

Marcos Alonso thought he had settled the tie with a neat finish in extra-time, only for League One Argyle to battle back and force one more opening.

Kepa kept his cool to conjure a fine save, however, on a day where Chelsea markedly missed Thomas Tuchel after the Blues head coach tested positive for Covid-19. The German could now be forced to miss Chelsea's Club World Cup campaign in Abu Dhabi next week due to isolation regulations.

Chelsea wait on Mount injury

After Mason Mount was forced off in the 97th minute, Chelsea assistant Arno Michels provided an injury update on the England midfielder.

“We will see. He felt it once in additional time, when taking a shot. So he realised quickly that he felt the pain and therefore we took him off. But we will see, he will have further exams. Hopefully it’s not too bad but right now I cannot promise."

"We asked the players to give us everything out there and not leave anything in the tank," said Schumacher.

"They should be really proud of themselves. We're obviously disappointed that we didn't get through, especially having a penalty so late on that would have taken it to penalties. But all in all, it was a good day."

Macaulay Gillesphey headed Plymouth into an early lead, converting ex-Chelsea youth midfielder Jordan Houghton's whipped free-kick.

Cesar Azpilicueta levelled via a fine backheel finish just before half-time, with Chelsea having hit the woodwork three times.

A first goal for the Spaniard in a year could not open the floodgates however, and the Blues were left to toil through extra-time for their win.

How Kepa heroics sent Chelsea through to fifth round

Chelsea's day started in the disarray of Tuchel's positive Covid-19 test, leaving assistants Arno Michels and Zsolt Low to take charge against Argyle.

The Pilgrims sent their disciples into raptures right from the off, with Gillesphey nodding home from Houghton's set-piece. Inch by inch the Blues built back into the contest, however, striking the woodwork three times before finally conjuring an equaliser.

Mateo Kovacic powered strikes against the bar and the post, with Callum Hudson-Odoi also nodding against the goal frame.

Chelsea found their leveller, however, with skipper Azpilicueta delivering at a crucial stage just before the break.

Jorginho threaded a neat ball to Mason Mount on the right wing, and Azpilicueta's fine backheel converted the England midfielder's cross.

Romelu Lukaku should have scored when Hakim Ziyech exchanged passes with Mount and fired across the face of goal, but the off-kilter Belgian could not reach the ball at full stretch.

Chelsea did have the ball in the net again shortly afterwards, with Azpilicueta turning home another backheel after a corner. But this time the defender was offside, and so the effort was quickly chalked off.

Chelsea failed to find the clincher in regular time, however, with replacement Timo Werner eyeing a chance when through on goal only to see James Wilson slide in and flick the ball to safety.

As the whistle blew to sound extra-time, Azpilicueta could only shake his head at the Blues being forced into 30 more minutes amid an already relentless schedule.

The first period of extra-time came and went without incident until the final minute, where Chelsea belatedly took the lead. Kai Havertz traded passes with Werner before laying a neat cutback on a plate for Alonso, who strode onto the ball and swept into the net.

Chelsea expected to ride out an event-less second period, but Plymouth had other ideas. Hardie intercepted Sarr's pass and raced into the area, only to be hauled down by the Frenchman. The Plymouth forward stepped up to take the penalty, but was left to bury his head in his hands as Kepa produced a fine save, smothering the ball and protecting the Blues' lead.

What the managers said...

Chelsea assistant Arno Michels: "I think we had for me 60 minutes where we could also lead 3-1, we had very many opportunities. We were a bit unlucky with crossbar, post, and at the same time we scored more or less an own goal to bring us into difficulty.

"But everyone would say the most important thing in the FA Cup is to go through, and that's what we did."

Plymouth manager Steven Schumacher: "We asked the players to give us everything out there and not leave anything in the tank.

"They should be really proud of themselves. We're obviously disappointed that we didn't get through, especially having a penalty so late on that would have taken it to penalties. But all in all, it was a good day.

"Ryan Hardie will feel that he's let everybody down today for missing the penalty, but I can honestly say he hasn't."

When is the FA Cup fifth-round draw?

The FA Cup fifth-round draw is on Sunday, February 6.

It will take place before Liverpool's home clash with Cardiff at around 11.30am and you can follow it live on the Sky Sports app and website.

Click Here For Official Team Sheet

Teams

Chelsea Kepa, Azpilicueta (c) (Chalobah 112), Christensen (Alonso 46), Rudiger, Sarr, Jorginho, Kovacic (Werner 82), Ziyech, Mount (Saul 97), Hudson-Odoi (Havertz 64)), Lukaku
Subs Not Used Bettinelli, Sharmon-Lowe, Kenedy, Barkley
Booked Jorginho, Havertz
Goals Azpilicueta 41, Alonso 105+1

Plymouth Argyle Cooper, Edwards (c), Wilson, Scarr, Gillesphey, Grant (Law 95), Camara (Broom 94), Houghton, Mayor (Randall 77), Garrick (Hardie 68), Jephcott (Ennis 58)
Subs Not Used Burton, Bolton, Lewis, Craske
Booked Cooper
Goals Gillesphey 8

Attendance 39,959

Referee Simon Hooper

VAR Mike Dean