Speaking to Norwegian outlet TV2, Solskjaer insisted that the Premier League runners-up will be active in the upcoming transfer window.
He said: “Of course, something will happen in the transfer window. We have to make some moves on the transfer window, but also with the team.
“It is never possible to sit back. You are constantly looking for reinforcements.”
Solskjaer reportedly wants to bolster his options at right-back, centre-back, central midfield and right-wing this summer.
United are reportedly in talks with Borussia Dortmund over the potential signing of long-standing target Jadon Sancho.