More alarm bells in the Alkmaar defence as Ollie Watkins finds space out wide. He fizzes it into the danger area but there is no one in a Villa shirt to turn it over the line.

We're seeing two very advanced left backs in this game. Emerson is belting forward at every opportunity.

At the other end, the home side are benefitting from a very advanced Rodinei. Wonder if his folks are fans of 'Only Fools and Horses'?

Youri Tielemans celebrated his first Aston Villa goal by making a heart shape with his hands.

This has been an excellent opening half an hour for Unai Emery and his players. They are playing with a real air of authority.

Image source, Reuters

Olympiakos are getting into some decent positions but they're not really testing Alphonse Areola.

Image source, Reuters

West Ham forward Mohammed Kudus in the thick of the action in Greece.

He's not been in it enough for the Hammers' liking so far, though.

This is a belter. Huge chance for AZ Alkmaar to pull a goal back but Vangelis Pavlidis - their danger man - puts it over. An incredible miss for someone who is bang in form in front of goal.

Megs! Konstantinos Fortounis pokes the ball between James Ward-Prowse's legs in the box but he can't gather it afterwards as Alphonse Areola comes to claim.

West Ham are in a real contest here.

Daniel Podence remains the most lively Olympiakos player. He finds a yard to chip a cross to the far side of the box but Mohammed Kudus does some very neat defending to win the ball ahead of Mady Camara.

Home skipper Konstantinos Fortounis does indeed whip the free-kick into the box but if there is one thing West Ham have down it is winning aerial balls into a box - both their own and the opponents'.

Frustration from the hosts as Sven Mijnans catches Youri Tielemans late. It results in the first booking of the game.

The 950 Villa fans inside the AFAS Stadion are making themselves held. This has been a strong and disciplined start by Unai Emery's side. There's a real belief about this side. AZ Alkmaar have yet to seriously test Emiliano Martínez.

Here's Rodinei again on the charge. This time he is caught by Pablo Fornals for a free-kick Olympiakos can whip into the box.

Brazilian Rodinei gets forward down the left and is found with a neat pass out wide. He drives at his man but fires his cross straight behind.

West Ham looking to take the early sting out of the home side. They've had some encouraging periods of possession with little hints of openings without fashioning anything clear in the box.

What a season Leon Bailey is enjoying.

That's his sixth goal - three in the Premier League and three in Europe.

West Ham need to be careful. Daniel Podence is finding space near their box with some clever movement. He's floating around and making himself hard to pick up.

This ground holds about 20,000 fans but it sounds like there's double that number with supporters making a right din. The decibel levels rise a notch when Dani de Wit stretches for a header which takes a deflection and goes out for a corner.

A nice West Ham move opens Olympiakos up but after Said Benrahma is found in the box his shot is poor and past the near post.