Tonio Liuzzi says he isn't concerned by rumours that he could be replaced in the Force India line-up by reserve driver Paul di Resta.

Speculation had suggested that the Scot - who has driven for Force India in Friday practice at four of the six events so far this season - could be promoted into a race seat with the Silverstone-based team at the expense of Liuzzi.

However Liuzzi, who scored his third top-ten finish of the season in Monaco, admitted that speculation was simply part of being in F1 and he wasn't worried about his future.

"Away from the racing, there has been speculation that Force India's reserve driver Paul di Resta is in competition for my seat," Liuzzi wrote in his column for ESPN. "I am not worried about these rumours; speculation is always at the door and all over the papers. I have a contract for two years with Force India and they believe in me and I believe in them, so our relationship is very good.

"They know exactly the problems I was having in China and Spain and they know that it was not due to anything else. Also I scored points at the first two races and again in Monaco, so they can see that I'm very much fighting for the team to meet its targets. It really doesn't worry me that this sort of stuff is printed and it's quite normal that you get this kind of speculation when you are competing at the highest level."

With Adrian Sutil also in the points, Force India strengthened its sixth place in the constructors championship and Liuzzi said the team wasn't giving up hope on closing the gap on Renault for fifth place.

"We're sixth in the championship now and that is a fantastic achievement if you consider where Force India was last year," he said. "Ahead of us we've got Renault and they are definitely starting to look like a tough cookie. Robert Kubica is doing really well in the championship and the team is doing a good job with their car.

"The only positive thing is that we are sort of two against one at the moment because Vitaly Petrov is struggling to consistently get into the points. The problem is, that with the current point system, when you finish in the top four positions you get way more points than if you finish where we are. So even though they might be just a little bit ahead of us, it is often enough for Robert to break into the higher positions and score a lot more points.

"But, for sure, it is up to us to keep improving our car and we won't give up the chase."