Michael O'Neill responds by making another change. Jordan Jones is on for Michael Smith.

Estonia goalkeeper Sergei Lepmets is then shown a yellow card for timewasting.

Estonia make a change in a bid to disrupt the Northern Ireland momentum. Rauno Sappinen is replaced by teenager free-scoring forward Erik Sorga. His average of a goal every other game in Estonia may give the visitors something to think about.

Gavin Whyte's shot is blocked as Northern Ireland attack again before a foul by George Saville brings Estonia much-needed respite.

Another Northern Ireland attack - it feels like they are building up a bit of momentum now - but Paddy McNair's cutback is behind George Saville.

That's better!

Substitute Conor Washington cuts in from the right and delivers the ball towards the near post. George Saville gets a flick on, forcing goalkeeper Sergei Lepmets to touch the ball over his bar.

Jamal Lewis tries to break into the box from the left but his touch is heavy and he knocks the ball out of play, summing up the quality of Northern Ireland's football at the moment.

What a shot!

Konstantin Vassiljev is causing Northern Ireland all sorts of problems and he rattles the woodwork with a powerful drive from outside the box.

The visitors really need to get closer to him because he is running the show at the moment.

Now Northern Ireland have a free-kick just outside the box after good work from Gavin Whyte. It's played short by Paddy McNair but not all the players are on the same page and Konstantin Vassiljev intercepts.

Good start to the second half as Jonny Evans pings a peach of a ball from inside his own half for Stuart Dallas inside the Estonia area but he can't trouble the goalkeeper with his shot.

The hosts get the second half under way.

There is a change for the second half for Northern Ireland - Conor Washington is on for Liam Boyce. Not the move I expected but something definitely needed to change.

No goals elsewhere in Europe since our last update, except in Russia, where the hosts lead San Marino 4-0 at half-time.

Northern Ireland tried to play it through midfield in the first half but it was a tactic that ultimately didn't work. Time to throw on Josh Magennis and go more direct?

Manager Ryan Giggs is "disappointed" by Wales' Croatia defeat and performance despite creating chances.

There goes the whistle for half time and Estonia lead.

Northern Ireland need to put in a much-improved performance after the break.

Northern Ireland need to be more alert at the back as Konstantin Vassiljev is left alone just inside the box to connect with a Artur Pikk cross but he volleys wide of goal.

This is a decent finish to the half by Northern Ireland as they break with pace. Paddy McNair's cross is cleared but the visitors pick up the loose ball through Stuart Dallas, who turns and lashes over.

Better from Northern Ireland as Gavin Whyte delivers a fierce cross from the right, George Saville gets away from his marker but flicks his header wide.

Madis Vihmann heads home a corner and, for a moment, it looks like Estonia have doubled their advantage but the referee spots a foul on Bailey Peacock-Farrell. A let off for Northern Ireland, who are struggling to find some rhythm at the moment.

Northern Ireland work the ball from left to right, trying to find a gap in the Estonia defence before Michael Smith lifts the ball towards the far post but the attack is brought to an abrupt end as the referee blows for an infringement.