Louisa Johnson has returned to 'X Factor' rehearsals after pulling out of a performance last night (09.12.15).

Louisa Johnson

Louisa Johnson

The 17-year-old hopeful is working away in the studios today and will be again tomorrow (11.12.15) ahead of the first part of the ITV show's two-day finale on Saturday (12.12.15), but will be "taking it easy" to ensure she doesn't do any damage to her voice.

A source told RadioTimes.com: "She'll be doing rehearsals today, they're all in studios today as they will be tomorrow. But she obviously will be taking it easy."

Louisa - who will go up against fellow hopefuls Reggie 'N' Bollie and Che Chesterman on Saturday - sparked fears she could miss 'The X Factor' final yesterday when had to pull out of a performance in Liverpool after falling ill.

She wrote on Twitter: "so sorry that im missing tonight in liverpool! Need to be on strict voice rest ahead of the biggest week of my life, it needs to be perfect (sic)."

An 'X Factor' spokesperson said: "Unfortunately Louisa is unwell and we have been advised by doctors that she currently needs to be on bed and voice rest ahead of this weekend's final. We're sorry to disappoint anyone who was looking forward to supporting her at her performance in Liverpool today."

Despite concerns, Louisa remains odds-on favourite to win the competition with many bookies.

Reggie 'N' Bollie are second favourites, and singer Che is an outsider ahead of Saturday's show, when two of the three will clinch a place in Sunday's (13.12.15) final.