The Britannia Stadium outfit sealed late deals for the duo from Werder Bremen and Aston Villa respectively, and the club's chairman believes they can make a big impact
Austria international Arnautovic moved to the Britannia Stadium on a four-year deal on Sunday, while Ireland arrived on deadline day from Aston Villa on a season-long loan.
The 27-year-old struggled to nail down a regular spot at Villa Park, making 57 appearances over three years at the club, and found himself out of Paul Lambert's plans for the new season.
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"They are both talented players and are joining a club that will hopefully bring the best out of them," he 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."