Koeman coached Newcastle’s summer signing at Feyenoord for two years.
Daryl Janmaat: “We can do well.
“We have a good squad and we have to take each game as it comes and at the end of the season we’ll see where we end up. I don’t know what we can do, but I think we have to focus on every game.
“We want to play in Europe. I don’t know if it’s possible this year but we want to and we will do everything to make that happen.
“It’s nice for me to come up against him (Ronald Koeman).
“He’s a good trainer. It’ll be nice to see him in the Premier League, and I’m looking forward to playing against him.
“I think he is going to do well at Southampton.
“It takes time, because they lost their manager and a lot of good players, and it’s not easy to win games when there’s been a lot of changes.
“I’m sure he’s going to do well because he’s a great trainer.”