But United's fringe players failed to impress the German in a disappointing match at Old Trafford.
Mason Greenwood was an exception, with the 19-year-old breaking the deadlock with a sublime volley from Luke Shaw's cross.
David Wagner's man had their tail up and should have won the game but Quentin Maceiras fired wide despite being unmarked in the box.
Iqbal became the first British-born player of Asian heritage to make a senior appearance for the club.
United had already secured top place in Group F and they will find out their last-16 opponents on Monday.
Rangnick admitted after the game that he wasn't too pleased with how his side performed.
He told BT Sport: "I was fully aware before the game that with this team that we played today, we haven't played together as team. The first half hour we did quite okay. We had a few unforced errors but had control of the game. We should have been 2-0 or 3-0 up. We had some great opportunities but we didn't score. We were a bit sloppy with those situations.
"After we conceded the equaliser we were not defending high enough or pro-active enough. If in the end, the score would have been 4-4, then nobody could have complained. There were quite a few debuts and game time for players who desperately need game time. I wouldn't say I was happy but it was okay.
"It was also good to see Luke Shaw back and hopefully he can be a candidate for the Norwich game.
"What was a little bit annoying was we gave the ball away and played too many balls into the first line of their area. Whenever we played the ball into the second or third line, we were always dangerous. I told them that before the game but they still played into that first line."