The 19-year-old defender found himself sidelined at Tottenham and has been farmed out on loan to Nottingham Forest, where he made his debut at the weekend in a 5-0 defeat at Burnley.
But, with World Cup qualifiers at home to Finland and Germany on March 28 and April 1 respectively, Toshack just wants to see Gunter playing matches.
He said: "Gunter is at least playing regularly now. He was on the wrong end of a hammering at Burnley last weekend but I would rather he was playing after what has happened to him at Spurs.
"I'm not concerned that he has gone to Forest, who are struggling a bit. Players have to make these decisions and I just want to see him getting regular matches, and he is at a level in the Championship where we have several of our players performing.
"He obviously feels that it is in his interest that he does play matches between now and the end of the season.
"At Spurs it looks like neither Chris or Gareth Bale are going to get much game-time for the rest of this season.
"The last time we were together as a squad, Chris talked to me about what he should do because there were a few offers of loans for him.
"My advice was to talk to his club manager and then make a decision. But it is better for us that our lads are playing regularly."
Toshack has named skipper Craig Bellamy in his squad despite serious doubts over his fitness following a knee injury.
The Manchester City forward has not played since damaging his knee against former club West Ham on March 1 and he is unlikely to play a first-team game for the Eastlands club before Wales' two crunch qualifiers.
But Bellamy has intimated to the Football Association of Wales he wants to be involved in the squad.
Such a situation could well give City boss Mark Hughes - Toshack's predecessor in the Wales job - some concerns with a UEFA Cup campaign also still in full swing.
Toshack has also included West Ham defender James Collins, who is only just back in light training following a hamstring injury, but club-mate Jack Collison is out with a dislocated knee that will see him sidelined for six to seven weeks.
Hull's Sam Ricketts has been included despite being banned from the Finland match following two bookings, while Blackpool's David Vaughan is out with a hamstring strain.
Toshack also has concerns over Peterborough defender Craig Morgan, who
has a foot injury. If Morgan and Collins both fail to recover in time, Middlesbrough's Rhys Williams - on loan at Burnley - will be involved, having been elevated from the Under-21 squad, who face a European Championship double-header against Luxembourg on March 27 and 31.
There is also a recall for Bristol City midfielder Gavin Williams, who was capped twice during his spell with West Ham.