Watch Turkey vs Honduras Live Streaming
Watch Turkey vs Honduras Live StreamingMcCartney was omitted from the Black Cats team that drew with Fulham on Sunday to stretch their run without a win to 14 games.
Northern Ireland's form has been just as bad over the years when they travel away from home.
Next up are Albania in a friendly on Wednesday, when Nigel Worthington's side will be looking for only their fourth victory in 21 away games.
McCartney said: "It is nice to meet up with a different set of lads. Hopefully when I go back the batteries will be recharged and I can look forward to the next game.
"We started the season really well at Sunderland and were in the top ten. Things were moving along nicely.
"But we haven't won in a while and and when that happens confidence is low and team spirit isn't what it should be.
