Gallagher has been in sublime form on loan at Crystal Palace this season.
The midfielder was rewarded this past week with a call-up to the England squad.
The Blues have told Gallagher that he is part of their plans moving forward.
Gallagher has scored four and provided two assists for Palace this season.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!