Last updated on .From the section Championship

Republic of Ireland midfielder Shaun Williams was involved in both Millwall goals

Frank Lampard says his Derby side "can't expect to turn up at half-time and win games" after losing at Millwall.

The Rams fell two goals down inside 20 minutes to goals from Lee Gregory and Shaun Williams, before David Nugent pulled one back after the break.

Lampard's side have lost twice in succession in the Championship, having conceded twice in the first 21 minutes during their 4-1 defeat by Leeds.

"The first half was slow, a terrible first goal because we should deal with balls in the box, we know they're coming at Millwall," Lampard told BBC Radio Derby.

"The second goal's a freak and it makes it a difficult afternoon for us. I can only give credit to the lads for their reaction in the second half.

"In the end we deserved to get something out of the game because we had a goal disallowed that was onside and we had numerous chances.

"You can't expect to turn up at half-time and win games in the Championship."

The Lions took an early lead when Lee Gregory flicked Williams' free-kick past Scott Carson, before Williams scored the second as his wayward first-time shot from 20 yards deflected in fortuitously off Fikayo Tomori.

Nugent's finished well from the edge of the box after a counter-attack, but Lampard's men could not find an equaliser despite late pressure, with Martyn Waghorn having a goal disallowed for offside after breaking through and putting away a one-on-one.

Millwall could have had the result wrapped up far earlier, however, Gregory almost doubling his tally three minutes after the opener and George Saville also going close for the home side in a fantastic first 15 minutes.

The Rams host Ipswich on Tuesday, with former England and Chelsea midfielder Lampard seeking a first home win in management.

"This is the Championship, this is the beauty of football, you get a chance very quickly to turn it around," he said.

"Some players today gave me a good problem in terms of people who came in and showed they had a desire to turn the game, so it's up to me, it's up to the players to react differently on Tuesday.

"We're working every day and we'll address things that we think we can improve on all the time."

Millwall 'stood strong' to secure win

Millwall manager Neil Harris told BBC Radio London: "In the first half in particular I thought we were excellent. We had a game plan to try to stifle Derby and nick the ball high up the park, and I thought it was really good.

"We tired in the last 20 minutes and we looked a bit edgy.

"The ground got a bit edgy because of the Middlesbrough game (when Millwall let a 2-0 lead slip on the opening day of the season) and I thought we stood strong in the end."