Villa currently sit ninth in the Premier League but have secured just one win in their last six outings, with their latest defeat coming at the hands of Manchester United last Saturday.
McLeish has been instructing the wingers in his current formation to support the lone striker during attacking phases.
"The disappointment of the Manchester United first half was we didn't get much support into the centre of the pitch and in the last third we held our positions more than we should of in terms of the flanks," he told reporters.
"When we do play the three up front, we are looking for the two wide men to get in and support the striker. You have to get into the back post. That's something we're trying to emphasise.
"It's a kind of Dutch system. If you watch their system every week you see the winger remit when the ball is the other side, is getting in the box.
"You see the winger coming in to help the centre-forward. We didn't see enough of that in the first half.
"We got more aggressive in the second half, we got higher on them which is what we asked for in the first half, believe it or not.
"We got that in the second half and we had some little opportunities which could perhaps have seen us getting a point. It wasn't to be."
Villa travel to the Reebok Stadium to face struggling Bolton on Saturday and McLeish believes his side will continue their new attacking philosophy.
"There's another opportunity this weekend. We've got to go there and be positive and that's what training has been in the last few days," he said.
"I always think we've got a chance and I believe the same thing for the Bolton game."