The Jags gaffer has completed a deal to keep striker Steven Craig in Glasgow until the end of the Irn-Bru First Division campaign and, after confirming that Paul Slane and Graeme Smith will not be kept on at the club, is expecting no further departures this month.
A number of Thistle's top players have been attracting admiring glances after their stunning start to the campaign.
In an exclusive interview with SportTimes last month, chairman David Beattie insisted there would be no high-profile departures from Firhill – and McNamara today reinforced that point.
He said: "That is us done. There won't be anyone else in and hopefully nobody out.
"We are very much looking to keep players here. There has been some speculation surrounding a few of them, which is healthy, but it can cause distractions so it is important that they keep focused and keep progressing.
"If people want someone just now, say for £50k, if you are in the SPL that £50k becomes five times that or even more because they are playing at the next level and performing, which I believe they are good enough to do.
"The chairman is right, we won't sell unless it is money we can't turn down just now.
"Paul has gone back to Celtic and we will have James Craigen and Christie Elliot coming back soon as well. Hopefully they will be ready to push for a place.
"The whole idea was to get them some game time and they have done that.
"Mark McGuigan benefited from the games he played at Albion Rovers, it has given him a bit of confidence."
After seeing their game with Hamilton Accies on Wednesday called off due to a waterlogged pitch at Firhill, Thistle head to Livingston tomorrow aiming to improve on an away record that has seen them take just nine points from a possible 21.
McNamara said: "Our away form is not a worry. It is disappointing, but it is important that we go away and treat each game as we do at home.
"We don't have our home fans, but we have taken a good support with us on the road.
"We need to be more clinical and make sure we finish teams off, like the Morton game where we didn't do that.
"Plus, you need wee decisions to go with you.
"We look at how the players play in the match and how they adapt themselves.
"I look at every match and how we could have done better.
"We lost at Hamilton when we were the better team and we were down to 10 men at Morton so there have been factors in the games.
"We need to make sure we keep our discipline and not just in how we tackle but with the shape as well.
"We can't afford to get too frantic and start chasing games and losing our shape because everything can then go to pot.
"We can't dominate for the whole game, but it is important we take our chances."