The 23-year-old -- who has scored one goal in his seven international appearances -- was due to undergo a medical and temporarily end a disappointing spell in the Bundesliga.

"The striker is currently on his way to Newcastle for medical checks," 'Gladbach confirmed on their Twitter account.

De Jong, who was born in Switzerland to Dutch parents, is the younger brother of Ajax captain Siem de Jong.

He has scored just six times for 'Gladbach since signing from Dutch side Twente two years ago for a reported �12.6 million ($20.8million).

De Jong, a prolific goalscorer for Twente, where he netted 45 times in 86 appearances, could make his debut against relegation-threatened Sunderland in the north-east derby on Saturday.