Posh revealed the arrival of four new players - David Cornell, Jorge Grant, Jack Marriott and Josh Knight - last week at a time when some club fans were starting to panic over the lack of close season signings.
Ferguson said: “The new signings are big. We have signed the major targets we identified at the end of last season because we stayed patient.
“We refused to panic and buy lesser players. We have signed the players we wanted.
“Jack Marriott was the easiest one to sort out, but Jorge and Josh had other offers so we had to be patient with them. We were and it’s paid off. I wanted David because he has good experience and he will push Christy Pym for the goalkeeper’s jersey.
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“I’m very happy, but I’m not completely satisfied as we still need a couple more. We have done good business in what has generally been a quiet market for Championship clubs.”
Ferguson doesn’t expect any further signings to be completed before the opening pre-season friendly of the season at Bedford Town on Saturday (July 10, 3pm).