How have they fared? We take a look here...
1. Marc Bola
The left back has made just six appearances for Middlesbrough since signing for an undisclosed fee.
2. Myles Boney
The goalkeeper has been a regular starter during his loan spell with Northern Premier side South Shields.
3. Yusifu Ceesay
The winger is on loan at National League North side Altrincham, where he has only just returned from injury.
4. Max Clayton
Clayton is still without a club after suffering a fresh injury blow after being released by Blackpool at the end of last season.