Walter Mazzarri has spoken of the importance of his new signings but may not start them against Arsenal on Saturday.
Daryl Janmaat arrived on Wednesday from Newcastle for £7.5 million, shortly after last week's recruitment of Younes Kaboul and club-record signing Roberto Pereyra.
A weakened team lost 2-1 to Gillingham in the EFL Cup on Tuesday, but Mazzari was sufficiently impressed by his players' performance in Saturday's defeat by Chelsea via the same scoreline he is considering giving them another chance.
Asked of Janmaat's arrival, the Italian said: "He is a very important player.