Eden Hazard climbed off the bench to notch a last-gasp goal and fire Chelsea into the last 16 of the UEFA Europa League with a 2-1 aggregate win over Sparta Prague.

Rafael Benitez's side went into the match boasting a 1-0 advantage from last week's first leg in the Czech Republic, leading the Spaniard to rest Frank Lampard and Branislav Ivanovic ahead of Sunday's trip to Manchester City.

But Sparta took a shock lead - and levelled the tie - on 17 minutes when David Lafata slotted home after Vaclav Kadlec pulled back Marek Matejovsky's quick free-kick.

Soon after the break, Oscar made a great run at the Sparta box before tee-ing up Ramires, who hit the post with a deflected effort.

Fernando Torres was played in one-on-one by Ramires soon afterwards and he tried to lob the on-rushing Tomas Vaclik but the keeper saved.

Chelsea skipper John Terry, who returned to the side after being absent for the first leg, volleyed at goal from 12 yards but Vaclik palmed away.

At the other end, Matejovsky made a strong run before shooting from 25 yards out in the centre but his low effort went just wide of Petr Cech's post.

John Obi Mikel then floated a long ball forward to Torres who chested it down to Victor Moses, with the winger letting one fly from 22 yards but Vaclik parried out for a corner, which Sparta subsequently cleared.

Ramires created a yard of space for himself to the right side of the box but pulled his shot wide before Tomas Zapotocny blasted just over from outside the box.

The clash looked to be heading into extra-time before Hazard scored a great individual goal in stoppage time with virtually the last kick of the game to spare the Blues' blushes.

Chelsea will now face either Ajax or Steaua Bucurest in the next round but this display was far from convincing from the reigning European champions.

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Teams

Chelsea Cech, Azpilicueta, Cahill, Terry, Bertrand, Mikel, Ramires, Moses, Oscar (Hazard 67), Mata Torres
Subs Not Used Turnbull, Cole, Luiz, Ferreira, Hazard, Marin, Benayoun
Booked Bertrand
Goals Hazard 90

Sparta Prague Vaclik, Zapotocny, Holek, Svejdik, Hybs, Vacha, Prilkryl, Matejovsky, Kadlec (Bednar 90), Krejcl, Lafata (Kweuke 82)
Subs Not Used Cech, Pamic, Vidlicka, Polom, Janos
Booked Lafata, Hybs, Prikryl, Matejovsky, Kweuke
Goals Lafata 17

Attendance 38,642

Referee A. Stavrev (Macedonia)