[MLS] Two former scoring stars could be headed back to MLS. Preki's arrival at Toronto may have produced another casualty. For three stories we're following ...

1. Ngwenya sighting in Houston

With Brian Ching sidelined from four to six weeks with a hamstring injury, Houston is giving a trial to former Dynamo attacker Joseph Ngwenya. A member of the Dynamo’s 2007 championship team, Ngwenya’s possible return to MLS has been rumored for more than a year; since he left MLS, he’s been playing for clubs in Austria and Turkey and also went on trial with Bayern Munich.

Ngwenya, 29, scored seven regular-season goals in 25 games for the Dynamo in 2007 and hit the equalizer in MLS Cup, which Houston won, 2-1, over New England. His week-long trial is scheduled to begin Thursday.

2. Toronto FC backline is in state of flux

Toronto FC has called a press conference for Wednesday when Jim Brennan is expected to announce his retirement to take a position as TFC's assistant general manager.

Brennan, the first player to join Toronto, is a popular figure in Ontario but reportedly has not seen eye to eye with new head coach Preki. He did not take part in training on Tuesday. One player reportedly at practice was trialist Adrian Cann. The Canadian veteran could provide help on the TFC backline, which struggled against Columbus.

3. Who will win Luciano Emilio sweepstakes?

With 41 goals in three seasons D.C. United and a desire to return to MLS, Brazilian Luciano Emilio is a hot commodity. FC Dallas and Philadelphia both reportedly have interest in signing the 31-year-old forward.

There are, however, two hurdles: any MLS team that wants to sign Luciano Emilio must acquire his rights from D.C. United. And he must reach an agreement with MLS on a salary, which isn't a sure thing. He returned to Brazil after rejecting a pay cut from D.C.