The Belgian striker spent last season on loan with Championship side Middlesbrough, but a report in the Northern Echo has claimed that their interest in no longer concrete, placing Celtic in the lead for his signing.
The 26-year-old netted eight goals and registered three assists in the Championship last term, as Boro reached the play-off final, starting 23 of 36 appearances. Whilst his goal record was not impressive - in comparison to his previous spell with Genk - Vossen won plaudits for his hard work and impressive team ethic.
The Northern Echo report states that Boro’s £2.4 million agreement to sign Vossen at the end of this season expired at the end of last month, and now the Teesside club are assessing all options, with Vossen no longer the main target.
This has given Celtic a boost in the race to sign him, following a report last week in the Sun which claimed they were making a move for his signature.
Celtic can offer a better financial package than either of the Championship duo, as well as European football and almost guaranteed silverware, making their offer an enviable one for any player.