The Sentinel says De Jong was watched at the weekend when he was an 83rd-minute substitute in Borussia Moenchengladbach's 2-1 home win over Schalke in the Bundesliga.
The 23-year-old Dutch striker has now appeared in 11 of Borussia's 15 fixtures, but all from the bench for a total of only 71 minutes playing time so far this season.
That, together with a reported fall out with manager Lucien Favre last season, appears to leave both him and his club ripe for a parting of the ways.
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