Everton boss Roberto Martinez was at Tannadice on Sunday to see United come from behind to secure a 2-2 draw with in-form Hibernian thanks to substitute Brian Graham's last-gasp equaliser.
United's kids such as Ryan Gauld and John Souttar have been the centre of much attention already this season but McNamara is not fretting at the prospect of his men being linked with moves elsewhere in January.
He does concede, though, that he will be happier when the transfer window closes again.
McNamara said: "It's part of the game these days. You can't get away from it.
"There will be more of it in the next few weeks so I'll be happy when the window shuts.
"As far as I'm concerned, it's important that we keep them all so they can continue to learn their trade here.
"I was very happy with the response shown by the players here as they showed a lot of spirit.
"It was always going to be a difficult match against Hibs and we had to fight very hard for a draw."
Hibs boss Terry Butcher insisted he could not fault his players despite throwing away a two-goal lead.
He said: "The lads put an awful lot into the game.
"They gave me everything and it looked like we were going to get the three points.
"But we can't afford to be too disappointed as we are improving all the time and that is the main thing."