The Boro chief executive told the club's official website that he is confident that manager Gareth Southgate will have three new face's on board before pre-season gets underway on 7th July.
"We are actively pursuing a number of players. Negotiations are going very well and we hope to have most of our incoming transfer activity completed before the players return to training on July 7," Lamb told the club's official website.
"Everything is going well and we are confident of completing two or three new signings soon.
"Our summer arrivals will endorse our vision of building a squad of players who are young, ambitious and high-energy performers supported with a smattering of experience,"