Two deadline day deals for two creative influences would appear to represent shrewd deadline day business at the Britannia Stadium.
Both Arnautovic and Ireland arrive having taken in colourful careers to date, but their match-winning capabilities remain without question and they could flourish under the right guidance.
Coates hopes Mark Hughes can get the best of a talented, if enigmatic pair, with all parties looking for a clean slate to bring about a reversal in fortune.
"They are both talented players and are joining a club that will hopefully bring the best out of them," Coates told The Sentinel.
"Mark has been out to see the striker (Arnautovic) in Germany and likes him. He's got a bit of a chequered history on the personal side, but he is coming to a club with a squad of good professionals and that should be good for him.
"Certain clubs work for certain players and we are hoping he's going to be the striker who can score the goals for us because that has been one of our deficiencies.
"Friends of mine at Manchester City remember Ireland coming through the system there and he has since had his moments.
"His career seems to have gone in the wrong direction of late, but Mark knows the guy well and he certainly has a good pedigree as a player."