Jul.21 (GMM) Fernando Alonso has urged teammate Kimi Raikkonen to "improve".

Spaniard Alonso has utterly dominated his fellow former champion at Ferrari since the Finn returned to the Maranello team for 2014.

We have only been able to count on one car again. Fernando Alonso

He argues Raikkonen's struggles are now hurting Ferrari, who at Hockenheim fell behind Williams in the fight for third place in the constructors' standings.

"In the constructors' championship we have lost a bit of ground to Williams," Alonso confirmed to the Spanish sports daily Marca after the German Grand Prix.

"We have only been able to count on one car again and we have to improve on that."