The FTSE 250-listed company will announce the appointment of Day, currently finance director at Reckitt Benckiser, alongside its trading update, according to Sky News.
Reckitt announced last October that Day would be leaving the company, and he is due to finish at the end of March.
Day has been an executive director and chief financial officer at Reckitt Benckiser for the past decade. His prior experience includes senior finance roles at Aegis, ABB and De La Rue. He is currently a non-executive director of WPP and AMEC.