Roy Hodgson admitted West Brom had not dealt with Newcastle's counter-attacks in the first half of their 3-1 defeat at The Hawthorns.
The Baggies were three goals down after 34 minutes following a Papiss Cisse brace and Hatem Ben Arfa effort.
While substitute Shane Long pulled a goal back, Hodgson's side slipped to defeat, with the hosts, having already used their three substitutes, ending the game with 10 men when James Morrison hobbled off with 10 minutes remaining.
The Baggies have now collected just one point from their last three games in their bid for Premier League survival.
Hodgson told Sky Sports: "We were 3-0 down at half-time on counter-attacks, I don't think we dealt with that particularly well on those occasions.
"Of course at half-time we're staring down the barrel of a gun because at 3-0 with the opponents with their tails up, all we could do was to try to make a game of the second half and try and crawl ourselves back into the game, which I thought we did reasonably well.
"We got one back early on, we made a fight of it but of course at three goals to nil or three goals to one against a team of Newcastle's quality it was always going to be very tough unless we got the second one fairly quickly which we did not do.
"And then we end up having to play with 10 men after Morrison's injury."