Redknapp wrote in The Sun: "At QPR's training ground on Friday, my assistant Joe Jordan rushed up to me and informed me Nigel Adkins had been sacked as manager of Southampton.
"I made him repeat what he said because I was that stunned, that surprised.
"Even now, having had time to digest it, it's still quite shocking. The most worrying aspect of all is that yet another young English manager has bitten the dust.
"On the one hand we have the Football Association and the brand new development centre, the ultra-modern academy to school the next breed of players and coaches to turn us back into a world force in the game. But the FA can bang on about Burton all they want.
"Yes, they can trumpet how it's the centre of the game in this country and how it will bring on a wave of great new home-grown managers.
"It doesn't matter one bit. In this country at the moment we have a lot of clubs owned by foreigners. And many of those foreign owners seem to think it is far 'sexier' to have a foreign manager.
"As a result, Southampton's Italian chairman Nicola Cortese has sacked the club's English manager to appoint an Argentinian in his place. I can't say the new man won't be a success. I wish him well.
"But this is a bitter blow for English managers and English football."