China's central bank is expected to keep rates on its medium-term policy loans unchanged on Tuesday, a Reuters survey showed, despite fresh signs the economic recovery is losing momentum. Tumbling credit growth and rising deflation risks in July have called for more monetary easing measures to arrest the slowdown, market watchers said, but a weakening Chinese yuan has constrained the central bank's efforts to imminently ease policy. "MLF rate cuts are seen as less likely at this juncture given the weakness in the yuan – USD/RMB is currently attempting to make a fresh year-to-date high," analysts at HSBC said in a note.