Maguire is currently the club's only senior fit central defender, with Raphael Varane, Lisandro Martinez, Jonny Evans and Victor Lindelof on the sidelines with injury problems.
The England international was again joined in the middle of the defence by Willy Kambwala against Bournemouth, with the 19-year-old benefitting from the team's fitness problems.
Ten Hag said that his side «struggled» in the opening half of Saturday's game and also mentioned a fitness issue for Maguire, but the ex-Sheffield United youngster was able to play the full 90 minutes of the match.
Man United twice came from behind to secure a point at the Vitality Stadium, with club captain Bruno Fernandes hitting a brace for his side, including one from the penalty spot.
Fernandes brace helps earn Man United a point«We know we have to win. We want to battle, to compete for the top positions. You see the game, we struggled first half, [Harry] Maguire was struggling but he overcame because we needed him to,» Ten Hag told BBC Sport following the contest.
«The second half was much better, the good thing is we fought back twice from a losing position. The team spirit is good. By the end it could've been more composed and calm and we could've played more chance out.
»The opponent was struggling because they gave so much energy in the first half and there were so many gaps but we didn't benefit from it."
Ten Hag also lavished praise on Fernandes for his captain's performance, with the Portugal international firing one into the back of the net from inside
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