Manchester United coach Alex Ferguson flew into Lisbon on Tuesday to support his former assistant Carlos Queiroz, whose job as Portugal coach is at risk amid a probe into allegations he insulted anti-doping agents.
"Yes, of course (he should stay as national coach). It is very difficult to get good men in football and Carlos is one of the good guys," Ferguson told reporters after speaking as a character witness at the Portuguese Football Federation (FPF).
The FPF is investigating allegations that Queiroz insulted anti-doping doctors during a surprise visit to the World Cup training camp in May, with local media reports saying the episode could cost the coach his job.
"He has years of sacrifice in the game, his six years at my club were fantastic and of course he should stay," Ferguson added.
The Manchester United manager said the case highlighted how anti-doping controls have become demanding in terms of access to footballers.
"Understandably in Carlos's situation, preparing for the World Cup as he was, this became a great interference for him," Ferguson said.
"It is not easy for Carlos. It is not a nice situation... because reputation is important in football and he has a great reputation. Hopefully it can get resolved and he can get on with his life," he added.
Queiroz has also called former international Luis Figo and the club presidents of Porto and Benfica among other witnesses.