Edinson Cavani came off the bench to give Paris St-Germain the advantage after the first leg of their Champions League last-16 tie against Chelsea.

The hosts went ahead through Zlatan Ibrahimovic's deflected free-kick.

But John Mikel Obi scored a precious away goal, capitalising on some terrible defending to sweep home a deserved leveller from six yards.

Chelsea's stoic defending had them on course for a draw, before Cavani steered home Angel di Maria's pass.

The 29-year-old Uruguay striker, who has been used primarily as back-up to Ibrahimovic this season, scored moments after substitute Oscar spurned a chance for the visitors.

But with the second leg to come at Stamford Bridge on 9 March, the Blues are still very much in contention thanks to Mikel's goal - and Thibaut Courtois' late save from Ibrahimovic.

Some have called this a make-or-break week for Chelsea, with this match followed by an FA Cup tie against Manchester City on Sunday.

With their Premier League title defence already over, Guus Hiddink's men will know by the end of the weekend whether they can salvage anything from a disappointing domestic season.

But whatever happens against City, they will be hopeful of progressing in this competition after a promising performance in the French capital.

This is the third successive season these teams have been drawn against each other, and both previous ties were decided on away goals. Chelsea progressed in 2014 despite losing the first leg 3-1 in Parc des Princes - though admittedly they were a more formidable outfit than this vintage - but were beaten last season.