The Cherries sought to provide him with all the tools possible for the final 14 games of the season, with only two clubs in the league signing more players in West Ham and Aston Villa.
The four arrivals saw Fraser Forster, Christos Mandas, Alex Toth and Rayan join the club, with Bournemouth reinvesting the money earned from the Antoine Semenyo sale into the latter two.
The club feels it has recruited where it needed to with injuries in the squad and the departure of Semenyo.
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They are set to see injured players David Brooks, Marcus Tavernier and Tyler Adams all return soon, which also fed into their planning for the window.
Right back Alex Jimenez is also set to sign on a permanent deal, with the Spaniard only one start away from the obligation to buy in his AC Milan loan being triggered.
Once that happens, the total the club has spent will rise to more than €450million across the past two-and-a-half years.
Assessing the squad, Iraola has options throughout.
In goal, Petrovic is likely to remain number one, but Mandas will push him to stay on form, and Forster will provide some good experience as third choice stopper.
An area of slight concern is left back, with Adrien Truffert the incumbent and in good form, but after Julio Soler was ruled out for a prolonged period, there are no other out-and-out left backs in the squad.
There is cover elsewhere, with Jimenez able to play there, but Iraola will be hoping he doesn’t have to move players away from their preferred positions to cover the left of defence.
Four centre backs will be fighting for the starting spots for the rest of the campaign.
Marcos Senesi. (Image: Richard Crease)
Marcos Senesi has been the best centre back at the club over the whole season, but he has been partnered by each of the other three in Bafode Diakite, James Hill and Veljko Milosavljevic.
Diakite seemed to be the first choice to pair with the Argentine, but after the Brentford defeat Hill came into the side and he has really impressed – so it is his spot at the moment, and Iraola has options.
At right back, Jimenez has really impressed, but he has also been good on the right wing.
Club captain Adam Smith is ever dependable if the Spaniard is deployed higher up the pitch, Hill can also shift across to the right of the back four and Lewis Cook can play there, too.
Cook’s primary spot of the number six in Iraola’s system is a spot where he is the only option there at the moment, although Adams, who was so good there earlier in the season, is close to a return.
Lewis Cook (Image: Richard Crease)
The central midfield pair of Cook and Alex Scott has been effective recently, with Scott in the eight, and the 22-year-old can also play in the six or ten if required.
Competing for that number eight spot is last season’s Daily Echo player of the season Ryan Christie, who is recently back from injury, and new signing Toth – so there is plenty of high-quality competition there.
The current number ten is Junior Kroupi, who has been good there, despite being primarily a number nine, allowing the side to play with two strikers.
That allows Iraola to have Kroupi’s finishing ability alongside Evanilson’s pressing and all-round game.
Other options in the ten are Tavernier and Justin Kluivert, although the Dutchman faces a battle to return to fitness before the end of the season after surgery.
Marcus Tavernier. (Image: Richard Crease)
As mentioned, Scott can also play there, as can Christie and Brooks, if needed.
On the wings, Iraola has some good options. While Semenyo has departed, Rayan has come in, and Brooks is not far away from a return.
Amine Adli has found some recent form on the left after taking a bit of time to settle in the Premier League, and Rayan, while primarily a right winger, came on on the left for his debut last weekend.
Jimenez is a utility player and Iraola has said he can play at left wing if needed, but he is primarily a right-sided player, and he has played as the starting right winger in the past two games.
Rayan, Brooks and Ben Gannon-Doak are other options on the right, with Gannon-Doak still recovering from injury, although he will hopefully be back at the end of the month or in March.
Tavernier can play on the right, the left and in the ten, and he has also been used in the number eight role this term, so, like Jimenez, he is a useful utility player.
Up front, Evanilson is the first-choice number nine, with Kroupi and Enes Unal the other options there.
In all, Iraola has good options across the pitch – so, especially with injured players set to return, the boss could have a number of positive selection headaches in the rest of the season.