Steve Clarke is hoping to keep Glenn Murray at Reading after his loan deal expired following the 2-1 win over Norwich.
QPR boss Harry Redknapp admitted he needs to strengthen his squad after his side's 0-0 draw with Crystal Palace.
QPR have signed United States defender Oguchi Onyewu.
The 31-year-old centre-back, who has been training with Harry Redknapp's side in recent weeks, joins as a free agent after leaving Sporting Lisbon at the end of last season.
Onyewu has 68 international caps to his name and had a loan spell with Newcastle in 2007.
He told the club website, www.qpr.co.uk: "I'm thrilled to get this period over with and finally secure my future.
"QPR are a club with huge ambitions to return to the Premier League and I wanted to be part of it.
"I had a really good feeling about QPR from the moment I arrived here. I've been welcomed by the club and I feel good here already.
"I've already integrated well into the group, so I'm looking forward to what will hopefully be a very successful and happy time here.
"This was an opportunity that was presented to me, that I was interested in, and I'm really pleased to be here.
"I want to help the club get back to the Premier League - that's why I've come here.
"Harry believes I can come in and help the team out and when you've got the backing of the coach and his staff, ultimately that tells me that I've made the right decision to come here and try this new challenge.
"England is a fantastic place to play and I can't wait to get started here."