Republic of Ireland striker Shane Long was happy with the team's display in the scoreless draw against Croatia.
"It was a tough test, they are ranked ninth in the world, but we defended well," said the man of the match.
"We knew they would have a lot of possession and we tried to hit them on the break.
"It was a good run-out for the lads, we are progressing and we are in good form going into two big games next month in the Euro qualifiers."
Those games are against Slovakia and Russia, who sit joint top of the group with Giovanni Trapattoni's team.
"Slovakia are first up and if we get three points it sets us up well for the Russia game," added the West Brom forward.
"If we get four points from the two games we will be doing well."
It has been a landmark week for Long, who completed his move from Reading to the Baggies on Tuesday.
He said: "It's been mad all right - I'm looking forward to Sunday and going straight into the deep end against Manchester United.
"It was nice to get almost 90 minutes to get my fitness right and I'm raring to go on Sunday."