Peterborough boss Darren Ferguson watched striker Saido Berahino fire the club out of the npower Championship relegation zone and insisted extending the teenager's loan stay at London Road is a priority.

The frontman borrowed from West Brom until January put the seal on a 3-0 home win over 10-man Derby with two goals in the late stages of a dramatic match.

Ferguson said: "Saido is only 19 but he is already a very good player. He is intelligent, caused Derby problems all afternoon and fully deserved his goals.

"We have already asked the question about whether we can extend the loan to the end of the season.

"Saido is loving life here and Steve Clarke, the West Brom manager, knows he is being well looked after."

Peterborough received a helping hand from referee Simon Hooper when he dismissed Jake Buxton with 20 minutes remaining, but the official failed to award the hosts what looked like a certain penalty when Mark Little was clipped inside the box.

But Berahino's late double ensured Peterborough pocketed the points and left Derby boss Nigel Clough to reflect on a bad day.

Clough said: "It was one of those games where everything that could do wrong did.

"We felt Jake was unlucky to be sent off as it looked like he won the ball before making contact with the player when picking up his second yellow card, but it is difficult to criticise a referee when your team has just lost 3-0.

"The final scoreline might be a tad harsh but you can't really have too many complaints when making the sort of errors we did for two of the Peterborough goals."