Goalkeeper Foster played the opening 45 minutes, during which he conceded two goals, while Zigic was introduced in the second-half and set up fellow striker Garry O'Connor for the winner two minutes from the end at Hong Kong Stadium.
Foster could do little about either of the home side's strikes and McLeish was satisfied with both players' displays in what turned out to be a narrow victory.
"I thought they did well," the Blues boss said.
"Zigic came on and showed that he can be a very powerful player for us next season with some nice touches and, of course, he's a massive presence in the penalty box.
"Ben Foster lost two goals, he won't be happy about that, but I don't think the defenders in front of him did very well for the goals.
"These are the rough edges that we have to iron out before the start of the season and I'm sure we'll do it because I've got a very determined bunch of players. I'm not concerned at this stage at all."
Source: PA
Source: PA