Boro managed to cap off a productive summer on deadline day as striker Andraz Sporar and midfielder James Lea Siliki joined the Teessiders from Sporting Lisbon and Stade Rennais respectively.
They followed Joe Lumley, Sammy Ameobi, Uche Ikpeazu, Martin Payero, Matt Crooks, Sol Bamba, Lee Peltier, Luke Daniels, Toyosi Olusanya and Onel Hernandez to the Riverside.
In the aforementioned signings there is a real mix of players with Championship experience and arrivals from abroad.
At this stage it’s hard to judge how the players from overseas will fare this season, making it difficult to predict Boro's strongest side.
Of course fans will have different opinions and the team will change throughout the campaign as injuries occur and the team changes system.
Following the end of the window, here’s how Boro’s squad is shaping up.
A message from the Football Clubs Editor
Our aim is to provide you with the best, most up-to-date and most informative Middlesbrough coverage 365 days a year.
This depth of coverage costs, so to help us maintain the high-quality reporting that you are used to, please consider taking out a subscription to our new sports-only package here.
Your support is much appreciated. Richard Mennear, Football Clubs Editor
In the aforementioned signings there is a real mix of players with Championship experience and arrivals from abroad.