Twice to order

"Only four managers have outwitted Pep Guardiola this season, and while Wigan’s Paul Cook, Shakhtar Donetsk’s Paulo Fonseca and Basel’s Raphaël Wicky were perhaps unexpected beneficiaries of propitious circumstances, Jürgen Klopp has done it twice to order." (The Guardian.)

Is "to order" a prepositional phrase or an infinitive in the sentence above?