The Teessiders have brought in goalkeeper Joe Lumley, experienced defender Lee Peltier, winger Sammy Ameobi and striker Uche Ikpeazu as they look to challenge for promotion from the Championship.
Warnock has said he still wants to make four or five more signings before the end of the transfer window – with the priority to add more competition up front.
It will be interesting to see what formations Warnock deploys in pre-season after using a back four and a back three last campaign.
As players continue to be linked with a move to the Riverside, there is bound to be more new arrivals in the coming weeks.
Here’s what we think is Boro’s strongest starting XI is as things stand – with the side preparing for their pre-season schedule.
. HIGH WYCOMBE, ENGLAND - FEBRUARY 28: Uche Ikpeazu of Wycombe Wanderers battles for possession with Ben Gibson of Norwich City during the Sky Bet Championship match between Wycombe Wanderers and Norwich City at Adams Park on February 28, 2021 in High Wycombe, England. Sporting stadiums around the UK remain under strict restrictions due to the Coronavirus Pandemic as Government social distancing laws prohibit fans inside venues resulting in games being played behind closed doors. (Photo by Richard Heathcote/Getty Images)
Uche Ikpeazu playing for Wycombe Wanderers. Photo: Richard Heathcote
. GK: Joe Lumley
Will expect to be Boro's No 1 goalkeeper this season after arriving on a free transfer from QPR. Photo: Getty Images
. RB: Anfernee Dijksteel
Missed the end of last season with an ankle injury but the 24-year-old is set to play a big part this campaign. The Dutchman's composure on the ball and ability to read the game will be a big asset regardless of the system. Photo: George Wood
1. GK: Joe Lumley
Will expect to be Boro's No 1 goalkeeper this season after arriving on a free transfer from QPR. Photo: Getty Images
2. RB: Anfernee Dijksteel
Missed the end of last season with an ankle injury but the 24-year-old is set to play a big part this campaign. The Dutchman's composure on the ball and ability to read the game will be a big asset regardless of the system. Photo: George Wood
3. CB: Grant Hall
Could be the perfect partner for Fry and the pair played well alongside each other last season. Hall, 29, missed the first half of last season through injury but was a commanding figure when he returned to the side. Photo: Stu Forster
4. Dael Fry
Warnock believes the 23-year-old centre-back is the best in the Championship. The Boro boss will hope Fry can stay fit and be a mainstay in defence. Photo: Getty Images