Paul di Resta's family was worried the Scot would race out of formula one after just a single season.

That is the claim of 2008 world champion Lewis Hamilton's father Anthony, who after splitting with his son now handles di Resta's F1 career.

The 25-year-old had a solid debut season with Force India and has retained that seat for 2012.

But the Vijay Mallya-led team repeatedly delayed the official announcement, despite long-running rumours that di Resta would race next year alongside a new teammate, Nico Hulkenberg.

Friday's news was a relief, Hamilton admitted to the Telegraph.

"He really deserves it and I'm delighted for him and the rest of his family.

"I know they were worried as it took so long to announce."

He described Force India as a "mid-ranking" team, hinting that some more powerful potential employers might pay attention to di Resta's battle with the highly-rated Hulkenberg next season.

"I reckon it's a level playing field but certainly if they drive well both will have other teams knocking at their door," said Hamilton.

"The great thing is that they are both there (at Force India) on merit, which suggests the team is moving in the right direction."