Stewart took over the Millers in 2008 and has poured millions into the South Yorkshire outfit, culminating in last season's promotion from League Two in United's first season at their brand new New York Stadium.
And Stewart is making no secret of the fact the Millers are targeting immediate promotion from League One next term and has full confidence in manager Steve Evans' squad, who host Huddersfield in their latest pre-season encounter on Saturday.
"This is a great opportunity to see the players before the action really gets under way," he told the club's official website.
"In my opinion this is by far the strongest Rotherham United squad we've had during my tenure at the club, and in fact one of the strongest I've known ever.
"There is an exciting nine months ahead of us as a football club, and one which we hope ends with us at the top end of Sky Bet League One.
"As a result, we're using these games at New York Stadium to test ourselves against real quality Championship opposition, as we believe this will prepare us for the teams we're going to face in the league this season."