"Of course I wanted to strengthen the squad but if we cannot sign, I need to stick with the project of the club," Pochettino told his weekly news conference.
"Of course (I am) disappointed because we are in a very good position and maybe with a help from some players we can remove the excuse that we are not a real contender.
"But we are close ... and we will fight to the end to be as high as we can."
Spurs were linked with a move for Chelsea striker Michy Batshuayi on transfer deadline day, but the 25-year-old joined Crystal Palace on loan in a deal announced after the window closed on Thursday.
Pochettino, who declined to comment on Batshuayi, said he would allow Dutch striker Vincent Janssen back into the first team after the player failed to secure a move away.
Janssen, who joined Spurs in 2016, had been training with the under-23 side.
"He is going to be involved with the first team from today, like another player with chances to be involved or play" Pochettino said.
"Before it was clear, he wanted to leave and was not in our plan. Now when you cannot achieve what you want, it's important for him to feel again he can be helpful."
(Reporting by Simon Jennings in Bengaluru; Editing by Peter Rutherford)
