Southampton boss Ronald Koeman is delighted with his ex-Eredivisie stars.
Koeman has backed summer signings Dusan Tadic and Graziano Pelle to be hits in the Premier League - once they get used to the pace of English football.
Serbian international Tadic marked his debut following a £10m switch from FC Twente with an assist in last weekend's 2-1 defeat at Liverpool.
Koeman, who paid old club Feyenoord £8m for striker Pelle, said: "Tadic played well against Liverpool.
"He had a great assist for the first goal. He is a quality player and he and Pelle have to realise it is not the Dutch league; it is high tempo for the whole match.
"Sometimes they have a problem with that but the qualities are there."
