#4 Thorgan Hazard (Borussia Monchengladbach)
Thorgan Hazard is a 25-year-old left winger who plays for Borussia Monchengladbach in the Bundesliga. He has also featured for Belgium's national team, having made 19 appearances since his debut in May 2013. He is the younger brother of Chelsea's Eden Hazard.
Thorgan took a different route to his brother by going through RC Lens' youth system, before joining Chelsea; Eden had gone through LOSC Lille's system. He signed for Chelsea in the summer of 2012, when he was 19 years old, for around £450k.
From here, Chelsea shipped Thorgan out on a couple of loan deals, firstly to Belgian side Zulte Waregem, then later to Gladbach, where his loan spell was so successful that the German club decided to buy him for £7m in 2015.
Thorgan Hazard is now a solid first team option for Gladbach, and has played so well over the last couple of seasons that his market value has reached around £35m.
Rumour probability: 6/10
According to Kicker (via bayernstrikes.com), Bayern are prepared to rival Borussia Dortmund to sign Hazard this January. With no concrete news about a contract renewal, the fact Hazard's contract runs out in 2020 leaves Gladbach in a tricky situation.
However, unless a large bid is made by Bayern this window, it's unlikely that Thorgan Hazard will jump ship, as he seems content at Gladbach right now.