lONDON-(AFP) – Chelsea left it late to clinch a 3-1 victory over 10-man Norwich that was marred by a serious injury suffered by Didier Drogba at Stamford Bridge on Saturday.

Andre Villas-Boas’s side were in danger of being held to a draw by newly-promoted Norwich when Grant Holt punished a mistake from Blues goalkeeper Hilario to cancel out Jose Bosingwa’s opener.

Drogba was stretchered off soon after when he landed heavily following an aerial collision with Norwich goalkeeper John Ruddy.

But Lampard ensured Chelsea won for the second time in three league games under Villas-Boas when he drove home a spot-kick with eight minutes remaining before Juan Mata marked his debut following his move from Valencia with a goal in the final moments.

“He (Drogba) lost consciousness completely on the pitch. It looked pretty nasty,” Villas-Boas said.

“We are just waiting for the full exams on his concussion and hopefully nothing is wrong.”

Chelsea’s sixth minute opener came from an unlikely source as Portugal right-back Bosingwa netted his first goal since November 2008 with a powerful long-range effort that flashed in off a post.

That should have been the springboard for a dominant Chelsea display, yet Holt equalised in the 63rd minute.

Holt was given a large helping hand by Hilario — playing in place of the injured Petr Cech — as the Portuguese stopper came way off his line in a failed attempt to catch a Wes Hoolahan cross and Holt was able to hook into the empty net.

It got worse for Chelsea moments later when Drogba landed in sickening fashion following his collision with Ruddy and the game was stopped for seven minutes while the Ivorian was carried off wearing a breathing aid.

However, Lampard got the second goal from the spot after Ruddy was sent off for bringing down Ramires and Spain winger Mata, on as a substitute, struck with a curler deep into stoppage time.

Blackburn missed two spot-kicks and then paid the penalty as Everton sneaked a 1-0 win at Ewood Park.

Rovers squandered a chance to take the lead early in the second half when Tim Howard saved Junior Hoilett’s penalty after Mauro Formica made the most of minimal contact from Ross Barkley to win the spot-kick.

Formica missed from the spot himself — shooting against a post — after being fouled by Phil Jagielka in the final minutes.

Everton made the hosts pay for those misses when Spanish midfielder Mikel Arteta stroke home a 90th minute penalty controversially awarded by Lee Mason for a Chris Samba challenge on Marouane Fellaini.

Swansea were held to a 0-0 home draw for the second successive week as Sunderland held firm in a dour struggle at the Liberty Stadium.

Brendan Rodgers’ newly-promoted team drew with Wigan seven days ago and found it equally hard to break down the Black Cats’ defence, with Scott Sinclair going closest with a shot that hit the bar.

Wigan maintained their unbeaten start as a fine double by Argentinian striker Franco Di Santo secured a 2-0 win over QPR.

Di Santo – tripling his total of goals for the club to only three goals in 32 appearances since joining from Chelsea for £2 million last August – struck in each half to give Wigan their first win of the season after two draws.

Wolves remain undefeated after Mick McCarthy’s team ground out a 0-0 draw at local rivals Aston Villa.

McCarthy’s men won their opening two league matches against Blackburn and Fulham and showed plenty of grit to keep Villa at bay in a hard-fought but ultimately uninspiring midlands derby.

Liverpool host Bolton later on Saturday, while on Sunday champions Manchester United take on Arsenal, Manchester City travel to Tottenham.

Also on Sunday, Newcastle play Fulham and West Brom host Stoke.