Chelsea boss Frank Lampard masterminded a crucial 2-1 win over Jose Mourinho's Tottenham, as recalled pair Olivier Giroud and Marcos Alonso fired the Blues to a victory which strengthens their hold on fourth place.

In his pre-match press conference, Mourinho had claimed he had been told Chelsea were switching to a back five for the fixture, and while that was proved correct, Spurs were unable to prevent Giroud (15) from scoring his first Premier League goal of the season or Alonso (48) capping a move which involved all four line-up changes made by Lampard.

While Spurs pulled one back late on when Erik Lamela's effort was deflected in by Antonio Rudiger (89), it could have been worse for the visitors had Giovani Lo Celso not been controversially let off by a VAR check when he appeared to stamp on Cesar Azpilicueta. Officials at Stockley Park later announced 'human error' had caused them not to send off the midfielder.

Lampard's win over his former Chelsea manager Mourinho gives the Blues a four-point cushion over their London rivals and extends Tottenham's dismal run at Stamford Bridge to one win in 34 trips.

How Chelsea boosted their top-four hopes…

Chelsea had gone four without a win in the league before Saturday but Giroud repaid Lampard's trust in him by scoring on his first start since November on 15 minutes, blasting in at the near post after Ross Barkley had bounced the rebound from the Frenchman's initial saved shot against the post.

Team news

Olivier Giroud, Mason Mount, Marcos Alonso and Ross Barkley were recalled to the first XI by Frank Lampard as Chelsea switched to a back five.

Spurs also went to a five-man defence, with Dele Alli dropped to the bench.

After a delay for a VAR offside check, Lampard pumped his fist in celebration at his striker's first Premier League goal since April and another rare starter, Alonso, almost joined Giroud on the scoresheet when he chested the ball up and volleyed a right-footed shot narrowly over the bar from distance as Chelsea stepped up the pressure.

Spurs had chances to get back level just before the break, with Lucas Moura's shot deflected over the bar by Azpilicueta and Davinson Sanchez forcing Willy Caballero to tip over from the resulting corner before Japhet Tanganga almost latched on to a long ball forward which had the Blues keeper back-tracking.

But it was the home side who finished the half on top, with Barkley shooting into the side-netting and they made it 2-0 three minutes after the restart when the four players Lampard brought into his XI combined. Mason Mount sent Giroud's flick-on to Barkley who squared for Alonso to fire his low shot past Hugo Lloris on his first league start since December.

Barkley then forced the Spurs keeper to push his shot from wide over the bar before Lo Celso escaped punishment for a nasty-looking challenge on Azpilicueta which left the Chelsea man with stud marks on his shin. With around 10 minutes left to play, officials confirmed Lo Celso should have seen red.

Player ratings

Home Team: Caballero (7), James (7), Azpilicueta (7), Rudiger (6), Christensen (7), Alonso (8), Jorginho (7), Kovacic (7), Barkley (8), Mount (7), Giroud (9).

Subs: Abraham (6), Willian (n/a)

Away Team: Lloris (7), Tanganga (6), Alderweireld (6), Vertonghen (6), Sanchez (5), Davies (5), Ndombele (6), Winks (6), Lo Celso (5), Bergwijn (6), Moura (6).

Subs: Lamela (7), Aurier (n/a), Alli (n/a)

Man of the match: Olivier Giroud (Chelsea)

There were more debatable decisions to follow, as Tottenham had penalty appeals waved away when Tanguy Ndombele collided with Reece James and Harry Winks went down under Rudiger's challenge, while Chelsea could easily have made it three, with sub Tammy Abraham denied by a fine save by Lloris and Alonso hitting the bar with a free-kick.

Spurs pulled one back when sub Lamela's low strike went in off Rudiger's heel to set up a tense finale, but the hosts saw out the game to secure just their sixth Premier League home win of the season - and land a big blow in the race for the top-four.

Opta stats

Frank Lampard's Chelsea are the first team to defeat a side managed by Jose Mourinho both home and away in a single league season.

Chelsea have won three consecutive home games against Spurs in all competitions for the first time since a run of seven between October 1996 and March 2002.

Tottenham have won just one of their last 34 away games against Chelsea in all competitions (D11 L22), a 3-1 win in April 2018.

Chelsea have won more points in Premier League London derby matches than any other team, with the Blues picking 461 points.

Tottenham have conceded 2+ goals in 10 Premier League away games this season - their highest such tally in a single campaign since 2008-09 (11).

Since he joined Chelsea in 2016, Marcos Alonso has more goals (17) and goal involvements (28 - 17 goals, 11 assists) than any other defender in the Premier League, with three of these goals coming against Spurs.

Olivier Giroud has been directly involved in 14 goals in his last 14 starts for Chelsea in all competitions, scoring 10 and assisting four.

No Premier League side has scored more own goals this season than Chelsea (3 - level with Watford).

What's next?

Chelsea are in Champions League action on Tuesday when they host Bayern Munich at Stamford Bridge in the first leg of their round of 16 tie; Kick-off at 8pm. After that, they face a trip to Bournemouth in the Premier League on Saturday, Feberuary 29; Kick-off at 3pm.

Meanwhile, Tottenham's next engagement is on Sunday, March 1 at home against Wolves; Kick-off at the Tottenham Hotspur Stadium is at 2pm.

Click Here For Official Team Sheet

Teams

Chelsea Caballero, Azpilicueta (c), Christensen, Rudiger, James, Jorginho, Kovacic, Alonso, Barkley (Willian 77), Mount, Giroud (Abraham 71)
Subs Not Used Kepa, Zouma, Emerson, Gilmour, Loftus-Cheek
Booked Christensen
Goals Giroud 15, Alonso 48

Tottenham Hotspur Lloris (c), Alderweireld (Aurier 78), Vertonghen, Sanchez, Davies, Winks, Lo Celso, Ndombele (Lamela 63), Tanganga, Bergwin (Alli 78), Moura
Subs Not Used Gazzaniga, Dier, Skipp. Fernandes
Booked Winks, Lo Celso
Goals Rudiger 89 (og)

Attendance 40,608

Referee Michael Oliver