The United boss gave his stars not featuring at the Qatar World Cup the opportunity to get match-ready ahead of the Premier League's return.
Advertisement
Anthony Martial, Aaron Wan-Bissaka, Alejandro Garnacho, Donny van de Beek, Martin Dubravka, Victor Lindelof and Scott McTominay all featured in the 4-2 defeat.
Ten Hag's men went 2-0 down inside 13 minutes, when Carlos Garcia-Die Sanchez and Anthony Lozano both found the net.
Advertisement
Martial reduced the arrears from the penalty spot, before Kobbie Mainoo levelled the score just after half-time.
However, Cadiz netted twice in the second period to secure the comfortable victory in the end.
Ten Hag was left unhappy with his teams performance, in particular the first half showing, despite the performance from some of his youngsters in the second 45 minutes.
"It is quite clear, we were not awake and still sleeping in the first 15 minutes,' Ten Hag told MUTV after the friendly.
Advertisement
Advertisement
"We prepared them. [We knew] They are a threat in transition and we have seen the second goal. It can't happen.
"You are not awake. Especially in the midfield, we got run off, this is not possible. Unacceptable.
"The first goal was as well. A set-play, bad organisation and bad discipline in the organisation, and you concede a goal."
Advertisement
"After that, we came into the game. We get a penalty, a clear one, and we deserve another one in the second half.
"We came into the game but we couldn't score an equaliser before half-time."
United are back in Premier League action when they host Nottingham Forest on December 27 at Old Trafford.