The Saddlers are working to appoint a No.2 after last week choosing Sadler to be their head coach.
Sadler said: “The thing running through the middle of it is everyone has to work together. The right person who comes in is someone who fosters all the beliefs I have. I want it to someone who challenges me, who when I give a certain thought says: ‘OK, but have you seen it from this point of view?’.
“I also want it to be someone who has the same value and desire to improve players. The values I stand for, that person must too.”
Sadler was assisted by club hero Richard O’Kelly during a spell as interim boss late in the season but the 66-year-old is reluctant to take a full-time role. Walsall will visit Solihull Moors for a pre-season friendly on Saturday, July 29 (3pm).