The owner of the Lotus team, Gerard Lopez, has hit back at claims the loss of respected technical chief James Allison has caused the recent slump in form at the team.

After four podiums in the opening five races, Kimi Raikkonen has only finished ninth at the last two races in Monaco and Canada, severely denting his championship challenge. 

Speaking to Finnish media, Lopez admitted: "It hasn't made the world championships any easier for us."

"It is clear we cannot afford a third consecutive miserable weekend at Silverstone," he added.

"Monaco is Monaco and we had a bad start to the weekend, off on the wrong foot, but we have now suffered badly in terms of both of the championships (after Canada)."

"This cannot be accepted. For Silverstone, I expect us to be absolutely as strong as we were before Monaco."

Lopez then slammed the suggestions about the effect of Allison' departure.

"It has no effect," he insisted. "He is a good man, but he's not a god."

As for Allison's future, speculation is linking the Briton with a move to Honda to design their test car as part of the development of their new engine supplier deal with McLaren from 2015.

According to Turun Sanomat the deal has already been done for Allison to lead a small group producing a test car as Honda looks to make up for a five year absence from the sport.

The move could also benefit McLaren who are currently recovering from losing their respected Technical Chief Paddy Lowe to Mercedes.

It is believed Allison will start work in 2014 giving the Japanese carmaker much of the year to test it's new power unit at the Suzuka and Motegi circuits.

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