Swiss-Irish bakery company Aryzta has named new North America and strategy chiefs as it tackles problems in the US, where issues with undocumented workers and a failed retail strategy prompted a $1 billion loss. 

American Dave Johnson, who previously worked at Swiss chocolate maker Barry Callebaut and Kraft, will become Aryzta's CEO North America on January 23.

The company also said that while Irishman John Heffernan will become Aryzta's chief strategy officer on February 28. 

In September, Aryzta reported a full-year loss of €907.8m after its bid to sell its Otis Spunkmeyer cookie products directly to retail customers backfired. 

The company also had to take a goodwill writedown of €492m in North America, as 800 experienced workers left its Cloverhill Bakery unit after a federal raid raised questions about their employment eligibility. 

"I look forward to working with Dave and John who will strengthen and deepen our team's expertise as we focus on our core strengths and to returning Aryzta to performance and growth," chief executive Kevin Toland said.

Mr Toland replaced Owen Killian as CEO as part of a sweeping management swap-out last year. 

Both Johnson and Heffernan, who is joining Aryzta from airports operator Daa, will be on the company's group executive committee.

Kevin Toland was also CEO of Daa, which operates Dublin and Cork airports.